/* */ comments don't exist in Sass, ending is determined by indent [attempt 2]

Same as #42, except that SCSS syntax won't be changed; it is now in a separate file.

Still has the same flaw that Sass block comments aren't being properly highlighted, but at least it doesn't gray out the rest of the document:
![screen shot 2014-02-23 at 3 55 18 am](https://f.cloud.github.com/assets/1570168/2240229/639e3e12-9c81-11e3-833a-c1e7f2299005.png)