Fixes missing url escaping on redirect.
- Fixes #110.
- Updated test to use escaped query strings, reveiling problem.
- Updated owin handler in the same way, although test is not failing (Cheating, I know).
- Reason for bug is that Uri.ToString() will return an *unescaped* string, even if original string was escaped.
- They mystery is how it has even worked at all with the old code.
Updated nuspec files for 0.6.2 release.
Updated version number to 0.6.2 for release.
Updated version number to 0.6.3 for development.