Log Message:
Update ruby-sass to 3.4.14.

3.4.14 (22 May 2015)

* Further avoid race conditions when caching.
* Only emit one warning for each line that uses the deprecated form of
  unquote().
* Stop parsing and emitting invalid @supports directives.
* Add a deprecation warning for using != to compare a number with units to a
  number without. Such a warning already existed for ==.
* Improve rounding of the results of color operations.