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
fix default value for elasticsearch_hosts to match expected format
Use Timer.Context instead of TimerContext (codahale migration)
Improve JSONBasicRollupOutputSerializer tests
Merge pull request #139 from cngupte123/kafka_producer_using_eventemitter_lib

Add Rollup EventEmitter to core
Merge pull request #168 from dlobue/fix_es_hosts_default

fix default value for elasticsearch_hosts to match expected format
Merge pull request #166 from lakshmi-kannan/bf_read_api_for_histograms

Feedback: Read API for histograms
Get rid of getBasicRollupDataToRoll
Get rid of getSimpleDataToRoll from Reader
Upgrade metrics lib to latest codahale version

Upgrade metrics lib to latest codahale version. Also remove the meter
from `ElasticIO.search()`. Timers provide the same functionality as
meters.
fix indentation
Merge pull request #170 from lakshmi-kannan/bf_get_rid_of_getBasicRollupDataToRoll

Astyanax reader cleanup - Part I
Merge pull request #171 from dlobue/upgrade_codahale_metrics_lib_for_bf-es

Upgrade codahale metrics lib for bf es