Nancy/Mvc projects, the ReturnUrl is now a string (instead of a Uri).
- Closes #89.
fixes issue #94. Using UrlHelperExtensions inside of an area.
Merge pull request #95 from khalidabuhakmeh/master

Using UrlHelperExtensions inside of an area. Fixes #94.
Updated NuGet pacakges and version to 0.3.4.