another attempt to make hung thread detection work

Conflicts:
	concourse-server/src/main/java/org/cinchapi/concourse/server/storage/Engine.java
	concourse-server/src/main/java/org/cinchapi/concourse/server/storage/temp/Buffer.java
	concourse-server/src/test/java/org/cinchapi/concourse/server/storage/EngineTest.java