added Sass scanner (work in progress)
changelog
Merge branch 'master' into sass-scanner
Merge branch 'master' into sass-scanner
fix order of SASS_FUNCTIONs
Merge branch 'master' into sass-scanner
Merge branch 'master' into sass-scanner

Conflicts:
	lib/coderay/scanners/css.rb
fix Sass highlighting in diff
don't nest :string recursively in :sass_inline
Merge branch 'master' into sass-scanner
Merge branch 'master' into sass-scanner
Merge pull request #120 from rubychan/sass-scanner

Sass scanner