Update Sass from 3.2.10 to 3.2.11

- Fix `@extend`’s semantics with respect to pseudo-elements. They are no longer treated identically to pseudo-classes.
- A more understandable error is now provided when the `-E` option is passed to the Sass command line in ruby 1.8
- Fixed a bug in the output of lists containing unary plus or minus operations during sass <=> scss conversion.
- Avoid the IE7 content: counter bug with content: counters as well.
- Fix some thread-safety issues.

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