Batch Rollup Writes
add configuration values for rollup batching. instrument rollup write time
add tests to RollupExecutionContextTest relating to batching
update all tests to use Write Contexts
handle failures during rollup appropriately
Merge pull request #1 from fourk/batch_rollup_writes2

Batch rollup writes part 2
Merge remote-tracking branch 'racker/master' into batch_rollup_writes

Conflicts:
	blueflood-core/src/integration-test/java/com/rackspacecloud/blueflood/service/MetricsIntegrationTest.java
	blueflood-core/src/main/java/com/rackspacecloud/blueflood/io/AstyanaxWriter.java
	blueflood-core/src/main/java/com/rackspacecloud/blueflood/service/LocatorFetchRunnable.java
	blueflood-core/src/main/java/com/rackspacecloud/blueflood/service/RollupRunnable.java
	blueflood-core/src/main/java/com/rackspacecloud/blueflood/service/SingleRollupReadContext.java
	blueflood-http/src/integration-test/java/com/rackspacecloud/blueflood/outputs/handlers/HttpRollupHandlerIntegrationTest.java
merge aftermath
push failed slots to the end of the ordering
Merge pull request #155 from fourk/batch_rollup_writes

Batch Rollup Writes
make concurrency gettable
Merge pull request #159 from fourk/make_concurrency_visible

make concurrency gettable on TtlCache
fix poms so intellij recognizes integration test source folders
update CHANGES to describe configuration changes relating to batching
indentation
Merge pull request #160 from fourk/fix_poms_for_intellij

fix poms so intellij recognizes integration test source folders
fix inverted time units on instrumentation
Merge pull request #161 from fourk/master

fix inverted time units on instrumentation