Log Message:
Update www/ruby-sass package to 3.1.7.

3.1.6

* The option :trace_selectors can now be used to emit a full trace before each
  selector. This can be helpful for in-browser debugging of stylesheet imports
  and mixin includes. This option supersedes the :line_comments option and is
  superseded by the :debug_info option.
* Fix a bug where long @if/@else chains would cause exponential slowdown under
  some circumstances.

3.1.5

* Updated the vendored FSSM version, which will avoid segfaults on OS X Lion
  when using --watch.

3.1.4

* Sass no longer unnecessarily caches the sass options hash. This allows
  objects that cannot be marshaled to be placed into the options hash.

3.1.3

* Sass now logs message thru a logger object which can be changed to provide
  integration with other frameworks¡Ç logging infrastructure.