add some comments about string interning
Corrected documentation for IngestSegmentFirehose

Ingest Segment firehose had incorrect documentation.
fix incorrect nullable annotations
update druid api ver
fix missing charsets
make constants final
classes that should be static
negating compare is bad
properly close reader
null check for something that cannot be null
remove unused columnConfig
Merge pull request #735 from metamx/misc-cleanup

Misc cleanup
fix synchronized on field getting updated
described how to enable experimental features
have better dimension exclusions
address cr
cleanup
fix import
Merge pull request #738 from metamx/dim-ex

Have better dimension exclusions
initialize segment view before announcing broker