Add TWSReleaseNotesView
update gitignore to ignore Xcode checkout files
Update project to remove unneeded files
Add a helper class to handle displaying the release notes view and wire it up in the App Delegate
Minor change to how we determine if it's a new release and add notes describing why I changed it.
Update credits
Merge remote-tracking branch 'upstream/master' into issue_216
Merge pull request #219 from aaronbrethorst/issue_216

Issue 216
Merge remote-tracking branch 'upstream/develop' into develop