Fixes issue U4-2708
Special commit for a special Lars-Erik
Merge pull request #181 from Attackmonkey/Tim-Payne-Hackathon-U4-2708

Fixes issue U4-2708
Updating the remaining methods in the Notification class so it no longer uses the legacy SqlHelper.
Minor update to the DefaultData so the used PetaPoco db object is consistent
Merge branch '6.2.0' of https://github.com/umbraco/Umbraco-CMS into 6.2.0