iOS: add "about" page and edit rotate/translate

contrib/mobile/iOS/Onelab.xcodeproj/project.pbxproj

contrib/mobile/iOS/Onelab/EAGLView.mm

contrib/mobile/iOS/Onelab/ModelListController.mm

contrib/mobile/iOS/Onelab/ModelViewController.h

contrib/mobile/iOS/Onelab/ModelViewController.mm

contrib/mobile/iOS/Onelab/Onelab-Info.plist

contrib/mobile/iOS/Onelab/en.lproj/iPadStoryboard.storyboard

...obile/iOS/Onelab/en.lproj/iPhoneiPodStoryboard.storyboard

contrib/mobile/iOS/Onelab/icon_rotate.png

contrib/mobile/iOS/Onelab/icon_translate.png