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
im deeply saddened but another case sensitivity problem and want to resolve these once and for all
Merge branch 'master' of github.com:metamx/druid
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
Add testOutOfOrderPruneDependentPostAgg
update to jetty 9.1.4 to fix bug https://bugs.eclipse.org/bugs/show_bug.cgi?id=430654