Merge pull request #541 from am11/master

Binary: Removes v8 version from the dir name
Added travis => gitter webhook
Merge pull request #544 from sass/travis-gitter

Added travis => gitter webhook
Importer: Uses libsass importers.
Importer: Moves the setter inside condition.
Code: Renames callback <-> success_callback.
1.2.3
Promoted @am11 to project lead
Merge pull request #549 from sass/am11

Promoted @am11 to project lead
libuv: Uses uv_async_send to dispatch callback.
Dispatches callback to uv_default_loop.
Importer-cb: Adds lock to acquire v8 main thread.
Importer: Moves mutex in context.
Importer: Fixes issue with casting.
Code: Cleanup and formatting.
Importer: Sleep() before second locks.
Importer: Uses uv_cond to solve the puzzle.
Credit goes to @txdv.
Importer: Destroys vars before leaving the scope.
Allow failures on node v0.11
Merge pull request #560 from sass/travis-update

Allow failures for node v0.11 on travis
Document indentedSyntax option

Introduced in #452 but not documented.