Add support for Cool

This change includes a brief (non-sensical) sample program I wrote to
illustrate many of Cool's language constructs, as well as a simple rule
to distinguish Cool files from Common Lisp or OpenCL (it has a line that
starts with the word 'class'). Further, it includes a second example
program adapted from an example contained in the Cool distribution
(list.cl), which contains a few further language constructs and captures
the style of a Cool program.
Adding Google Apps Script (.gs) as a JavaScript extension.
Add RAML support
languages.yml: added an interpreter entry to Mercury section
Add Oz to languages.yml
Add grammar for Oz
Add some examples for Oz
Misspelling correction
Support for gradle files
add language grammar for Isabelle theorem prover
Removing Mercury directory from vendor.yml
Merge pull request #1795 from github/mercury-vendor

Removing Mercury directory from vendor.yml
Corrections by @pchaigno
Add grammar for Oz
Misspelling correction
Merge branch 'master' into cool

Conflicts:
	lib/linguist/heuristics.rb
	lib/linguist/languages.yml
	lib/linguist/samples.json
Be explicit about tm_scope
Adding Cool grammar
Merge pull request #1796 from github/cool

Cool
Merge pull request #1782 from anpar/master

Add Oz to recognized languages