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

I'm using opensLeftViewControllerOnLandscape & resizesFrontViewControllerOnLandscape on iPad to keep frontViewController the same width. Those features should also cover the #127 issue.