Version bump.
Update gitignore.
Update jvm opts.

Setting the mapred child opts in the JT is worthless, because the TT
always loads them from the JobConf.
Version bump.
Update README.
Merge pull request #34 from airbnb/master

JVM opts, bump version
Metrics version bump.
Merge pull request #35 from airbnb/master

Metrics version bump.
Fix assignment of tasks to dead trackers.

Sometimes after we kill a tracker, we try to assign tasks to it because
the heartbeat expiry period hasn't been reached.
Merge pull request #36 from airbnb/master

Fix assignment of tasks to dead trackers.