Fixing bug that prevented interactive view controller transitioning from working. Also changing private methods prefix from '_' to 'PM_' as per recommendations from https://developer.apple.com/library/ios/documentation/cocoa/conceptual/CodingGuidelines/Articles/NamingMethods.html
Fixing bug that prevented interactive view controller transitioning from working.
Also changing private methods prefix from '_' to 'PM_' as per recommendations from https://developer.apple.com/library/ios/documentation/cocoa/conceptual/CodingGuidelines/Articles/NamingMethods.html

pm-dev/PMTabBarController,pm-dev/PMTabBarController,pm-dev/PMTabBarController