separate jshint config for specs

specs need a separate jshintrc, since chai needs '"expr": true' option
because of chaijs/chai#41

Gruntfile.js

@@ -18,9 +18,16 @@ module.exports = function (grunt) {
             },
             all: [
                 'Gruntfile.js',
-                'lib/**/*.js',
-                'spec/**/*.js'
-            ]
+                'lib/**/*.js'
+            ],
+            specs: {
+                options: {
+                    jshintrc: 'spec/.jshintrc'
+                },
+                files: [{
+                    src: ['spec/**/*.js']
+                }]
+            }
         },
         mochaTest: {
             tests: {

spec/.jshintrc

@@ -0,0 +1,39 @@
+{
+    // JSHint Configuration File
+    // See http://jshint.com/docs/ for more details
+
+    "maxerr"        : 5,       // {int} Maximum error before stopping
+
+    // Enforcing
+    "bitwise"       : false,   // true: Prohibit bitwise operators (&, |, ^, etc.)
+    "forin"         : false,   // true: Require filtering for..in loops with obj.hasOwnProperty()
+    "immed"         : true,    // true: Require immediate invocations to be wrapped in parens e.g. `(function () { } ());`,
+    "quotmark"      : "single",
+    "undef"         : true,
+    "unused"        : true,
+
+    // Relaxing
+    "debug"         : true,    // true: Allow debugger statements e.g. browser breakpoints.
+    "browser"       : true,    // true: defines globals exposed by modern browsers
+    "devel"         : true,    // true: define globals for some development functions (alert, console)
+    "shadow"        : true,    // true: Allows re-define variables later in code e.g. `var x=1; x=2;`
+    "validthis"     : true,    // true: Tolerate using this in a non-constructor function
+    "boss"          : true,    // true: Tolerate assignments where comparisons would be expected
+    "evil"          : true,    // true: Tolerate use of `eval` and `new Function()`
+    "expr"          : true,
+
+    // Environments
+
+    "trailing"      : true,    // true: Prohibit trailing whitespaces
+    "node"          : true,    // Node.js
+    "nonstandard"   : true,    // Widely adopted globals (escape, unescape, etc)
+
+    // Legacy
+    "white"         : true,    // true: Check against strict whitespace and indentation rules
+
+    // Custom Globals
+    "globals": {
+        "describe": true,
+        "it": true
+    }
+}