Mac: Add NSAutoreleasePool in PlatformCreateWindow to make sure CefBrowserHostView is dealloc'ed on window destruction

git-svn-id: http://chromiumembedded.googlecode.com/svn/trunk/cef3@1534 5089003a-bbd8-11dd-ad1f-f1f9622dbc98
Add the cefsimple sample application which demonstrates the minimal functionality required to create a browser window.

git-svn-id: http://chromiumembedded.googlecode.com/svn/trunk/cef3@1535 5089003a-bbd8-11dd-ad1f-f1f9622dbc98