fix for issue @include content blocks
Removing duplicate syn match definition
Adding support for "placeholder selectors"
Setting :syntax sync to fix incorrect highlighting
Highlighting scss interpolation inside strings
Recognizing the fade-in/fade-out functions
Merging changes from kknoer
Adding example of #23
Typo
Removing check for very old vim version
Simplifying definition for scss interpolation
Recognizing function as variable value
Fixing some issues with @import
Fixing highlighting of properties (#22)
Moving some statements around
Fixing issue with highlighting @include params
Fixing highlighting of fns with hyphens (#31)
Fixing issue with string escaping (#20)
Updating example.scss with examples from sass ref
Recognizing null