UTTypeCopyPreferredTagWithClass returns nil mimetype for css when there is no network
Update some release notes and clean pull requests

This closes #39
This closes #40
This closes #41
Merge fix for CB-6532 (This closes #55)
CB-6571 Fix getParentForLocalURL to work correctly with directories with trailing '/' (This closes #58)

Fixes 2 failing unit tests in mobile spec.