add some comments about string interning
fix column selector on varying incr index schema
background announce segment cache
add docs for background segments loading
parallelize segment loading
add documentation
update java-util
Merge pull request #755 from metamx/update-java-util

update java-util
Merge pull request #756 from metamx/dimdim-comments

add some comments about string interning
Merge pull request #748 from metamx/fix-columnschema-access

fix column selector on varying incr index schema
fix background annoucing race condition
fixes #733
add test for parallel loading
Merge pull request #749 from metamx/background-segment-announcing

Parallelize segment loading + background announcing
prep next rel
[maven-release-plugin] prepare release druid-0.6.155
[maven-release-plugin] prepare for next development iteration
keep default behavior
fix comment
update doc versions