Make sure Touchstone login is presented as a form sheet on when on an iPad. #527
Call completion handlers to prevent any actions until the login sheet is completely dismissed. #527

Fixes bugs in the animation process when the Touchstone login sheet is presented on top of a modal dialog.
Use the default UITableView grouped background color. #527
Correct the tint color of the Libraries modal Ask Us/Tell Us forms. #527
Merge pull request #552 from MIT-Mobile/3.6/touchstone-login-changes

Touchstone Login Changes