Implemented opening of the leftViewController upon rotation and resizing of the frontViewController.

Four new options, useful when using on iPad (keep the frontViewController the same size by always opening the leftViewController when changing orientation to landscape.
opensLeftViewControllerOnPortrait
opensLeftViewControllerOnLandscape
resizesFrontViewControllerOnPortrait
resizesFrontViewControllerOnLandscape
Merge branch 'feature-alwaysopen'