Main changes for supporting arbitrary rollups
Introduce base class Rollup and BasicRollup class for default stats rollup
Unit test changes
Integration test changes
Make Reader return Points instead of List<Object>
Change tests to use Points instead of List<Object>
Revert rename of yammer metric names
Tiny: rename variable
variable renames, method renames, fix unused imports
Fix whitespace
Merge pull request #90 from lakshmi-kannan/bf_arbitrary_rollups

RFR: Refactor code to support arbitrary rollups