CLC-2081 - Set -J-Xmx900m for travis
https://jira.media.berkeley.edu/jira/browse/CLC-2081

Also remove the allow_failures, since we're now on jRuby 1.7.4

**Note: wait with merging until the Travis.ci build is successful**
Merge pull request #1208 from christianv/CLC-2081

CLC-2081 - Set -J-Xmx900m for travis