Extract context from HTML
Backwards-compatible context compilation
Leverage $$noContext
Simplify compile code for #55.
Simplify extract for #55.
Extract line numbers from HTML

Closes #5
Extract line numbers from translate filter
Merge branch 'msgctxt'

Closes #55.

Conflicts:
	lib/extract.js
	test/extract.coffee
Merge branch 'html-line-numbers' of https://github.com/gabegorelick/angular-gettext-tools

Conflicts:
	lib/extract.js
	test/extract.coffee