CORE-267 First pass at updating the SDK objects.
CORE-267 - Adding username as this is no longer necessarily the same as the email.
CORE-267 - Adding the notification message into the SDK as it's a portable object and generic.
CORE-267 - Removed the duplicated property
Merge branch 'feature/CORE-267' into develop

Conflicts:
	ManyWho.Flow.SDK.csproj