Update the migration scripts
Added method to UsageRefactorService to get all existing load balancer host usage records and convert to a map of load balancers ids.  Implemented method in HostUsageRefactorRepository to get all load balancer host usage records and return a list.  Completed logic in UsagePollerHelper to process existing events.  Started work on logic for processing current usage.  Added more tests for process existing events.  Added UsageRefactorService to usage-jpa-persistence.xml.
Merge branch 'five_minute_poller_refactor' of github.com:lbrackspace/atlas-lb into five_minute_poller_refactor
Removed unneccessary methods from the UsagePoller interface and UsagePollerImpl.  These methods will be used through the service layer.
Added UsagePollerGenerator to generate some mock records for testing.  Added methods in the service layer and repository layer to batch create and batch delete to/from lb_host_usage and lb_merged_host_usage tables.  Wrote more tests.
Merge branch 'five_minute_poller_refactor' into usage-refactor-db-testing