Merge pull request #15 from brndnmtthws/master

Careful with tracker handling.
Add .gitignore.
Refactoring the code to make it easier to reason about
Cleaned up imports.
Added meter for flaky tracker killing.
Increased JVM overhead.
Set -Xms in addition to -Xmx.

Conflicts:
	src/main/java/org/apache/hadoop/mapred/ResourcePolicy.java
Fix for the tracker with no slots problem.
Metrics version bump, pom cleanup.
Merge pull request #18 from brndnmtthws/master

Minor improvements
Added support for ContainerInfo for mesos 0.19.0

This pull request implements a very simple way of configuring the container image (and options) passed when launching Task Trackers. This can work especially well when coupled with the a [Docker Containerizer](http://github.com/mesosphere/deimos) as a way of managing system dependencies requires for running Hadoop jobs.
Fixed a NullPointerException that caused no tasks to be launched
Fixed NullPointerException further down
Updated the README to reflect container changes
Fixed wording, err...
Added an extra section to the readme about opt-in
Merge pull request #20 from tarnfeld/feature/containers

Added support for ContainerInfo for mesos 0.19.0
Doc: Remove double space

Signed-off-by: Chengwei Yang <yangchengwei@qiyi.com>
Doc: fix for metrics configuration

Signed-off-by: Chengwei Yang <yangchengwei@qiyi.com>
Added .travis.yml.