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
avoid using Math.abs

review comment on - c6f5311
To avoid overflow issues and unnecessary calls to Math.abs.
Merge pull request #471 from metamx/minor-optimization

avoid using Math.abs
prepare for next release
[maven-release-plugin] prepare release druid-0.6.85
[maven-release-plugin] prepare for next development iteration
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