Refactor BasicRollup output serializer and fix a bug in tests
Fix bug in HistogramRollup when number of bins computed could be -ve
Expose get methods for histograms in AstyanaxReader and RollupHandler
Add histogram JSON output serializer and test
Expose HTTP endpoint and add HTTP handler for histograms
Add tests for hisotgrams HTTP endpoint
Add changelog to CHANGES
Switch to codahale metrics instead of yammer
Add RollupEventEmitter
Add EventEmitter test
Emit rollup to eventemitter
Add the eventemitter jar
Make eventemitter non-blocking
Change the eventemitter test
Fix the rollup runnable to emit using new emitter interface
Removed some whitespaces
Added a try catch and fixed an error message
Make changes to EventEmitter Test
Add missing licence headers
Refactor the RollupEventEmitter and use the new Emitter using generics