Fixed Bug in Migrations Configuration.
Moved as much Logic as possible from the MVC...

...Controllers to existing or new Web API Controllers.
- Moved from Forms-Authentication to OWIN and Bearer Token.
- Updated Breeze to 1.4.11.
- Used Route-Attributes and removed RpcStyleApi-Route.
Completed Lockout-Logic in ApplicationOAuthPro...

...ApplicationOAuthProvider.
- Reviewed CapsDbInitializer and creation of default roles and default
admin.
- Show error message on login view.
Added support for external logins.
Reviewed User Management Module.

- Added DateTimeKindAttribute according to
http://stackoverflow.com/a/19301623/1286665 to make sure, the
Author.CreationDate-Property gets serialized to JSON with a DateTimeKind
of UTC.
- Merged UserController into UserMgmtController.
- Persist logonSuccessRoute during an external login.
- Fixed misc. problems/bugs in user management.