Upgrade to Hadoop 2.3.0
Merge branch 'master' into hadoop-version-update
upgrade default version in CluHadoopIndexer and merge from master
update default version in docs
Compute postage only when required
fix tests
time series post Aggregation improved

move post aggregation to finalise results
Merge branch 'master' into optimize-postAgg-calculation

Conflicts:
	server/src/test/java/io/druid/client/CachingClusteredClientTest.java
fix casing and add comment
persist-n-merge in separate pool

persist-n-merge in separate pool, do not block intermediate persists
rename thread
enable cache monitor on computes by default
default cache size to zero
update docs
modify comment
fix dependent PostAggregators
review comments
Merge pull request #480 from metamx/compute-cache-monitor

enable cache monitor on computes by default
Merge pull request #476 from metamx/non-blocking-persist-n-merge

Non blocking persist n merge
complete javadoc, add comment, use Lists.reverse