starting changes
adding new formatter class
started updates to json response
Added lock to cassandra key cache, changed test port to 9001
Merge branch 'develop' into brian-scratch
fix nagative value maximum aggregators always return zero

Signed-off-by: pstan <tanpinsiang@gmail.com>
Merge branch 'tanpinsiang-maxagg' into develop
Added deleteDataPoints() to DataStore and implemented it for Cassandra. Also fixed bug in putDataPoints() where data points in the same data point set were added to the same row even if their timestamps said otherwise.
Finished writing results to file
Added tests for negative values for the max aggregator.
Merge branch 'brian-scratch' into develop
Merge branch 'develop' of github.com:proofpoint/kairosdb into develop