Added section on union data sources
Merge branch 'master' into fix-datasource-doc
fixed typo and added info that union can take any number of dataSources
initial commit for roaring bitmaps
a whole bunch of fixes and some ugly conversion code
skip timestamp checking, remove duplicate code

1) No need compare all timestamps when all the values are within range
2) remove redundant code.
specify default service name for coordinator
make things actually work with roaring
make things actually work with roaring
fix things for real-time ingestion
remove crazy handler code
remove more legacy code
cleanup unused imports
fix
cleanup dead code
revert change
fix conversion
Merge branch 'master' into fix-datasource-doc
fixed typo, added note on matching schema requirement for unioned data sources
Merge pull request #814 from metamx/fix-datasource-doc

Added section on union data sources