Support all languages commonly used alongside Ruby

[nathany]

A meta-request for Scanners, in a similar vein to #73.

Rails & Sinatra

• Ruby - done, though still improvements Bring method/local variable distinction to Ruby Scanner #72, Ruby scanner can't parse complex method definitions #82, Ruby scanner sees Symbol instead of Operator #89
• JavaScript - done
• CoffeeScript - default with Rails Asset Pipeline, CoffeeScript Scanner #76

Templating

• ERB - done
• Haml - done
• Slim - streaming, cleaner, faster than Haml, more popular with Sinatra users?

CSS

• CSS - done
• SASS/SCSS - default with Rails Asset Pipeline, Sass Scanner #93
• LESS - some developers choose LESS (used by Twitter Bootstrap)

Data formats

• JSON - done
• YAML - done, improvements YAML scanner improvements #84
• XML - done, improvements XML Scanner doesn't like DTDs #83

Cocoa

• MacRuby - Ruby with special selector syntax for method calls
• RubyMotion - MacRuby minus a few things (require, eval)
• Objective-C - Objective-C Scanner #46

JVM

• JRuby - done, it's just Ruby.
• Java - done
• Mirah