Fixed a bug where the Mouse delta wasn't being updated properly.
Removed a redundant call to Ogre::Root's shutdown method, as it's called first thing in the destructor.
Commented out some code causing crashes on close.  Added a todo with more info.  TLDR: Ogre's cleanup is dumb.  This may need to be changed/updated in the future should Ogre get their act together.
Merge branch 'master' of github.com:BlackToppStudios/Mezzanine