Parse less and scss and collect all css rules.
Make `Quick Find Definition` work in scss and less files.
Merge remote-tracking branch 'upstream/master'
Merge branch 'release' of https://github.com/adobe/brackets
Merge branch 'master' of https://github.com/MiguelCastillo/brackets
Merge branch 'release' of https://github.com/adobe/brackets
Merge branch 'master' of https://github.com/MiguelCastillo/brackets
Parse nesteds rules in less and scss files.
Merge branch 'master' of https://github.com/adobe/brackets

Conflicts:
	src/thirdparty/CodeMirror2
Merge branch 'master' of https://github.com/adobe/brackets
Merge branch 'master' of https://github.com/adobe/brackets
Merge branch 'master' of https://github.com/MiguelCastillo/brackets
Better handling of nested rules by skipping nested at-rules, line comments and block comments.
Also provide full selectors showing all the parent selectors in Quick Edit and Quick Find Definition.
Merge branch 'master' of https://github.com/adobe/brackets
Get the complete selector for nested group parents.
Merge branch 'master' of https://github.com/adobe/brackets
Don't show descendent selectors when searching on an ancestor selector.
Updated variables in brackets.less.
Updated variables in brackets_codemirror_override.less.
Added Core UI variables.