Increased list of fields that are verified
Moved _monitor_message and _compute_update_message code and
tests to MonitorNotification and ComputeUpdateNotification
- Converted migration to South data migration
- Made a few changes to data migration migration error reporting
- Changed the way exists were being updated
- Removed ComputeUpdateInstanceNotification
- Ensured that exists events are considered when populating rawdata
but not while populating instanceusages
Merge pull request #132 from anujm/F215-B

Incorporated Review comments/misc other changes
Only populate from image_meta if available
More safe population from image_meta
Fixing safe image_meta in _process_exists
Merge pull request #161 from rackerlabs/stable-2

Stable 2