add ensime
Merge branch 'mesos'
Merge branch 'mesos'
Merge branch 'mesos'
Merge branch 'mesos'
Merge branch 'mesos'
Merge branch 'mesos'
bug fix for javadoc
Merge branch 'mesos'
Merge branch 'mesos'
Merge branch 'mesos'
Merge branch 'mesos'
support customized java options for master, worker, executor, repl shell
Add RDD.subtract.

Instead of reusing the cogroup primitive, this adds a SubtractedRDD
that knows it only needs to keep rdd1's values (per split) in memory.
Merge branch 'mesos'
Merge branch 'mesos'
Merge branch 'mesos'
Detect when SendingConnections drop by trying to read them.

Comment fix
Add fault tolerance test that uses replicated RDDs.
Merge pull request #490 from woggling/conn-death

Detect when SendingConnections disconnect even if we aren't sending to them