[SPARK-1342] Scala 2.10.4

Just a Scala version increment

Author: Mark Hamstra <markhamstra@gmail.com>

Closes #259 from markhamstra/scala-2.10.4 and squashes the following commits:

fbec547 [Mark Hamstra] [SPARK-1342] Bumped Scala version to 2.10.4
[Spark-1134] only call ipython if no arguments are given; remove IPYTHONOPTS from call

see comments on Pull Request https://github.com/apache/spark/pull/38
(i couldn't figure out how to modify an existing pull request, so I'm hoping I can withdraw that one and replace it with this one.)

Author: Diana Carroll <dcarroll@cloudera.com>

Closes #227 from dianacarroll/spark-1134 and squashes the following commits:

ffe47f2 [Diana Carroll] [spark-1134] remove ipythonopts from ipython command
b673bf7 [Diana Carroll] Merge branch 'master' of github.com:apache/spark
0309cf9 [Diana Carroll] SPARK-1134 bug with ipython prevents non-interactive use with spark; only call ipython if no command line arguments were supplied
Revert "[Spark-1134] only call ipython if no arguments are given; remove IPYTHONOPTS from call"

This reverts commit afb5ea62786e3ca055e247176def3e7ecf0d2c9d.