[ShellScript] Rewrite

Issue links
-----------
Intends to close sublimehq#434
Fixes sublimehq#626
Fixes sublimehq#190
Fixes sublimehq#46

Goodies
-------

* Proper context sensitive command invocations
* Variable expansion as from ShellScriptImproved
* Backtick handling as from ShellScriptImproved
* No with_prototype contexts
* Generic options handling
* Builtin-commands know their valid options
* Renamed Shell-Unix-Generic to bash, as it's really just bash (and dash)

About 1300 syntax tests, tested out in the wild with various bash scripts.

Deficiencies
------------

The heredocs handling is still not perfect, but it gets the job done if you
don't have a function definition, inline if-block or compound command on
the same line as the start of the heredoc token.

* It's easy to bring back the embedded language highlighting for particular
  heredoc tokens, but this is omitted for now.
* It's easy to embed the regex language for regex matching in if-blocks at
  this point.

Acknowledgements
----------------

* @jfcherng for starting ShellScriptImproved and the huge amount of syntax
  tests,
* @okdana for creating syntax tests,
* @FichteFoll for pointing me to the Ruby syntax for heredoc handling,
* @keith-hall, @wbond for their suggestions about scope names.

ShellScript/Miscellaneous.tmPreferences → ShellScript/Indentation.tmPreferences

@@ -2,7 +2,7 @@
 <plist version="1.0">
 <dict>
 	<key>name</key>
-	<string>Miscellaneous</string>
+	<string>Indentation</string>
 	<key>scope</key>
 	<string>source.shell</string>
 	<key>settings</key>

ShellScript/Makefile

@@ -0,0 +1,15 @@
+# The update script is located in the tools subdirectory because otherwise
+# Sublime will read the file during start-up. No need for that.
+
+all: $(addsuffix .sublime-syntax, $(basename $(wildcard *.yml)))
+
+%.sublime-syntax: %.yml tools/update-commands.py
+	@printf "$< ==> $@ ... "
+	@python tools/update-commands.py $< $@
+	@echo "Done."
+
+test:
+	@-/usr/bin/env bash test/syntax_test_bash.sh 2>&1 \
+		| sed -nE "/^test\/syntax_test_bash.sh: line [[:digit:]]+: syntax .*/p"
+
+.PHONY: test