update travis.yml
added 'UITabBarItem' factory methods and 'UITabBarSystemItem' constants
use constants instead of shorthands
added the 'remove_accents' method
added note about
added 'convert_point(to:/from:)' and 'convert_rect(to:/from:)' methods, to round out 'convert_origin_to, convert_frame_from' methods
version bump. adds 'remove_accents', UITabBarItem factory methods, and 'convert_point/convert_rect to:/from:' methods