mesos/spark — pull request #152 by dennybritz (2012-07-18 20:25:02+00:00)
Title: Always destroy SparkContext in after block for the unit tests.

- Fixes #148
- Tested. Tests still passing, except for one that wasn't passing before, see #150
- I intentionally didn't instantiate a `SparkContext` in a before{} block, because every test may instantiate one with different parameters, or not use one at all.