Added Histogram Aggregator functionality. Also added parameter checking for sampling value in graph.js. (Colby)
updated version ready for release, added beginnings of integration tests.  Added fix for missing cache folder exception
Added port parameter
Added build target for integration tests
Test names are now dynamically created. Added the ability to add data points. Delete all added datapoints when the test is complete. If the resulting value is a double, use the closeTo assertions.
Change test queries to use absolute start and end time instead of relative times. This will prevent potential test failures in the future, albeit 10 years from now.,
Added tests for groupBy. Now verify that datapoints are deleted.
Fixed bug where groups were being closed twice. This caused an error message like this "ERROR org.kairosdb.core.groupby.Group - Could not delete group file: /tmp/grouper-06038081201021571058.cache" to be displayed.
Validation added to verify that at least one tag is included.
DeleteDataPoints now removes the index row key if no columns exist and removes the metric name from the Strings column family.
Reformatted code.
When a delete occurs, the caches are now cleared. Added a delete REST API for deleting a whole metric.
Changed config file to no replace
Fixed config file flag in build.  Fixed integration test
Merge branch 'cnbates-master' into develop
updated version to start working on 0.9.2
starting changes for tag query
Almost finished with tag query
Added logging
added log statment