fix jetty threads getting stuck

Fix Jetty threads getting stuck on exceptions
fix backwards compat issue
Merge branch 'master' of github.com:metamx/druid
fix broken CombiningSequence.toYielder behavior
Merge pull request #538 from metamx/fix-jetty-exception-handling

fix jetty threads getting stuck
union query fix and a broken test
clean up event receiver firehose factory
Merge branch 'master' of github.com:metamx/druid
add sanity unit tests
add header
Merge pull request #543 from metamx/fix-combining-sequence-yielder

fix broken CombiningSequence.toYielder behavior
Merge pull request #545 from metamx/union-query-fix

Union query fix
update java-util and add more merge sequence tests
more comprehensive merge sequence tests
ignore jetty exception test for now
[maven-release-plugin] prepare release druid-0.6.109
[maven-release-plugin] prepare for next development iteration
ObjectColumnSelector/JS aggregator support for multi-valued columns.
JavaScriptAggregator: Context.newArray makes nicer arrays than Context.javaToJS.
More consistent ObjectColumnSelectors. JS aggregator tests for nulls.