Added test case and possible fix for issue #5
Merge https://github.com/tucaz/newrelic_microsoft_sqlserver_plugin into develop
Updating SqlDMLActivity Query to include Mike's improvements to performance, and grouping. Updating Plugin to better handle the possiblity of dealing with multiple results for a single SQLPlanHandle, StatementHash, CreateDate, and Query time.
Execution Counts are now summed, which should fix the exceptions users were seeing when running against both Azure and On-Prem SQL. Modified tests to assert this behavior.

Updated ReadMe to include Uninstall instructions!