Log Message:
Update ruby-sass to 3.2.7.

3.2.7

* The index and zip functions now work like all other list functions and treat
  individual values as single-element lists.
* Avoid stack overflow errors caused by very long function or mixin argument
  lists.
* Emit relative paths when using the --line-comments flag of the sass
  executable.
* Fix a case where very long numbers would cause the SCSS parser to take
  exponential time.

3.2.6

* Support for Rubinius 2.0.0.rc1. All tests pass in 1.8 mode. 1.9 mode has
  some tests blocked on Rubinius issue 2139.
* Support for JRuby 1.7.2.
* Support for symlinked executables. Thanks to Yin-So Chen.
* Support for bubbling @supports queries in the indented syntax.
* Fix an incorrect warning when using @extend from within nested @media
  queries.
* Update the bundled version of listen to 0.7.2.