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.