Release version 2.0.7

This is a bugfix release to fix Hive sql_connector jar on Ubuntu, and to set appropriate Yarn default increment-allocations.

• Fix Hive sql_connector jar on Ubuntu ( Issues: #216 COOK-65 )
• Style updates ( Issue: #217 )
• Set Yarn increment-allocation appropriately for Fair Scheduler ( Issues: #218 COOK-67 )