2.2.1 : MacOS, fix date, version info, usage, license

- Fix issue with `date` in Mac OS X.
- Fix package name in `package.sh`.
- Use GNU commands when available.
- Remove conflicting `date` related tests.
- Display usage when running without arguments.
- Refactor `usage()` function; remove short usage.
- New `--version` argument for displaying version info.
- Clarify licensing; rename files.
- Update function header format.
- Update README.md.
- Version 2.2.1

.travis.yml

@@ -20,4 +20,6 @@ matrix:
 
   fast_finish: true
 
-script: ./tests
+script:
+  - ./aserta --version
+  - ./tests

LICENSE.md

@@ -0,0 +1,8 @@
+The MIT License (MIT)
+Copyright (c) 2016-2017 - José Luis Cruz
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

@@ -1,6 +1,6 @@
 # aserta
 
-a handy unit testing framework, in shell script; *originally forked from [assert.sh](https://github.com/lehmannro/assert.sh)*
+a handy unit testing framework; *originally forked from [assert.sh](https://github.com/lehmannro/assert.sh)*
 
 [![language: bash](https://img.shields.io/badge/language-bash-447799.svg?style=flat-square "made in Bash")]()
 [![version: stable](https://img.shields.io/github/tag/andamira/aserta.svg?label=stable+version&style=flat-square "stable version")](https://github.com/andamira/aserta/commits/stable)
@@ -14,21 +14,23 @@ a handy unit testing framework, in shell script; *originally forked from [assert
 
 - [Features](#features-)
 - [Examples](#examples-)
-  - [Sourcing](#sourcing-)
-  - [Running](#running-)
+  - [Sourcing the script](#sourcing-the-script-)
+  - [Running a single test](#running-a-single-test-)
 - [Install](#install-)
+  - [Mac OS X](#mac-os-x-)
 - [Reference](#reference-)
   - [Functions](#functions-)
     - [Return Status](#return-status-)
     - [Expected Output](#expected-output-)
     - [String comparison](#string-comparison-)
     - [Flow Control](#flow-control-)
   - [Options](#options-)
+- [License](#license-)
 
 ---
 
 
-## Features [▴](#table-of-contents "Back to TOC")
+## Features [△](#table-of-contents "Back to TOC")
 
 - minimal setup & lightweight interface
 - time benchmarks with real-time display of test progress
@@ -38,9 +40,9 @@ a handy unit testing framework, in shell script; *originally forked from [assert
 - skip individual tests
 
 
-## Examples [▴](#table-of-contents "Back to TOC")
+## Examples [△](#table-of-contents "Back to TOC")
 
-### Sourcing [▴](#table-of-contents "Back to TOC")
+### Sourcing the script [△](#table-of-contents "Back to TOC")
 
 Write the following snippet into a new file named `my-tests`,
 in the same directory as the `aserta` script is located.
@@ -95,11 +97,11 @@ $ echo $?
 1
 ```
 
-### Running [▴](#table-of-contents "Back to TOC")
+### Running a single test [△](#table-of-contents "Back to TOC")
 
-It is possible to run tests without sourcing the script, just by
-passing the desired test function as an argument to the script, just
-after the script options, and after that the test function arguments. E.g.:
+It is possible to run a single test without sourcing the script,
+just by passing the desired test function as an argument to the script
+just after the script options, and then the test function arguments. E.g.:
 
 ```
 $ aserta --verbose assert_raises unknown-command 127
@@ -108,18 +110,20 @@ $ aserta --verbose assert_raises unknown-command 127
 
 This way of running tests has several disadvantages:
 
-- Not supported functions: `skip`, `skip_if` and `assert_end`.
-- Tests can only be run one at a time.
+- Only one test can be run on each call.
 - Can't show test suite summary statistics.
+- Doesn't support: `skip`, `skip_if` and `assert_end`.
 
-To run a script without sourcing, first make sure the script is executable:
+To run a test function without sourcing the script,
+first make sure the script is executable:
 
 ```
 $ chmod +x aserta
 ```
 
-And remember to at least provide the option -v (--verbose) or the option -x
-(--stop) to show the result of the test:
+And remember to provide the option -v (--verbose) or the option -x
+(--stop) if you want to see the result of the test.
+Otherwise it wont have any effect.
 
 ```
 $ ./aserta -v assert_success true
@@ -138,12 +142,20 @@ test #1 "false" failed:
 ```
 
 
-## Install [▴](#table-of-contents "Back to TOC")
+## Install [△](#table-of-contents "Back to TOC")
 
 - Manually
 
+  The latest stable version:
+
+  ```sh
+  $ wget git.io/aserta.stable && chmod +x aserta
+  ```
+
+  The bleeding edge version (`master`):
+
   ```sh
-  $ wget https://raw.github.com/andamira/aserta/master/aserta && chmod +x aserta
+  $ wget git.io/aserta && chmod +x aserta
   ```
 
 - With [bpkg](http://www.bpkg.io/)
@@ -158,14 +170,29 @@ test #1 "false" failed:
   $ basher install andamira/aserta
   ```
 
+### Mac OS X [△](#table-of-contents "Back to TOC")
+
+The script should work as it is in a Mac OS X system.
+
+But it is encouraged to install the GNU version of coreutils and grep
+in order to achieve greater speeds in tests with regular expressions,
+and to be able to measure time in milliseconds, instead of full seconds.
+
+A very easy way to install them is by using [Brew](http://brew.sh/):
 
-## Reference [▴](#table-of-contents "Back to TOC")
+```
+$ brew tap homebrew/dupes
+$ brew install coreutils grep
+```
+
+
+## Reference [△](#table-of-contents "Back to TOC")
 
 
-### Functions [▴](#table-of-contents "Back to TOC")
+### Functions [△](#table-of-contents "Back to TOC")
 
 
-#### Return Status [▴](#table-of-contents "Back to TOC")
+#### Return Status [△](#table-of-contents "Back to TOC")
 
 - **`assert_raises`** `<command> [exitcode] [STDIN]`
 
@@ -182,7 +209,7 @@ test #1 "false" failed:
   Verify the command terminated in failure.
 
 
-#### Expected Output [▴](#table-of-contents "Back to TOC")
+#### Expected Output [△](#table-of-contents "Back to TOC")
 
 - **`assert`** `<command> [STDOUT] [STDIN]`
 
@@ -213,7 +240,7 @@ test #1 "false" failed:
   Verify the command output *matches* the extended REGEXP pattern.
 
 
-#### String Comparison [▴](#table-of-contents "Back to TOC")
+#### String Comparison [△](#table-of-contents "Back to TOC")
 
 - **`assert_str_equals`** `<string> <expected string>`
 
@@ -244,7 +271,7 @@ test #1 "false" failed:
   Verify the first string *matches* the extended REGEXP pattern.
 
 
-#### Flow Control [▴](#table-of-contents "Back to TOC")
+#### Flow Control [△](#table-of-contents "Back to TOC")
 
 - **`assert_end`** `[suite]`
 
@@ -265,8 +292,7 @@ test #1 "false" failed:
   E.g. if the test needs root privileges or network access.
 
 
-
-### Options [▴](#table-of-contents "Back to TOC")
+### Options [△](#table-of-contents "Back to TOC")
 
 See `aserta --help` for command line options on test runners.
 
@@ -278,3 +304,12 @@ command line option |   ENV variable  | description
 `-v`, `--verbose`   | `$DEBUG`        | Real-time output for every individual test.
 `-x`, `--stop`      | `$STOP`         | Stop running tests after the first failure.
 
+
+### License [△](#table-of-contents "Back to TOC")
+
+- The work previous to the fork of `assert.sh` was released under the LGPLv3 license.
+  - View [COPYING](https://github.com/andamira/aserta/blob/master/COPYING)
+   and [COPYING.LESSER](https://github.com/andamira/aserta/blob/master/COPYING.LESSER)
+- The new work in the current project `aserta`, is released under the MIT license.
+  - View [LICENSE.md](https://github.com/andamira/aserta/blob/master/LICENSE.md)
+