Fixes #230
Merge branch 'master' of https://github.com/TransitApp/SVProgressHUD
Fixing background mask

This is a fix for the background mask misalignment issue referenced here: https://github.com/TransitApp/SVProgressHUD/issues/342 , with the specific fix recommended by @Tokanod
fixing TransitApp#342 - when rotating while the progresshud is visible, the background and the hudview are positioned correctly