edx/edx-platform — pull request #5609 by jzoldak (2014-10-16 20:47:05+00:00)
Title: Remove references to /tmp in tests

Including:

* Change path for mongo_metadata_inheritance to use unique temp dir
* Update SASS_CACHE_PATH with thread-safe temp dir
* Remove hard coded directory reference for grades download tests
* Remove hard coded directory reference for direct mongo test

@benpatterson