Fixed the core rotation image being offset and thus not perfectly centered

Frame was originally set with x and y coords of -1, now is set using
the views bounds(which have x and y coords of 0)
Merge pull request #1 from mlnlover11/master

Smoothing out the animation
Fixed preferences to work on both iOS8 and iOS7, re did preferences icon and sizes
Fixed animation constantly restarting(due to it being repetitively added and removed)