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
Support for postgresql

I think it was the last request using 'end' missing the postgresql support.
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
fix web supplier test
fix concurrent modification exceptions in local cache
prepare for next release
[maven-release-plugin] prepare release druid-0.6.86
[maven-release-plugin] prepare for next development iteration
populate cache on sequence close
CachePopulatingQueryRunner -> CachingQueryRunner

Populate and use cache at compute node level
address code review comments
turn down too much logging; gp
Merge pull request #458 from metamx/stream-cache

use and populate cache at compute node level