Removed a lot of unnecessary code in YKUINavigationBar.  No more draw rect.  The items in the nav bar are managed by a UINavigationItem
Updated category names
Title changes now support animation (again)
better error checking on yk_colorWithRGBA
Added tests, and some general cleanup
Added a comment to explaint the rationale behind the animation
Added docstring to yk_colorWithRGBA
Created struct YKRGBAColor to manage colors for cleaner codes
Fix'd a problem that would only show up on iPad because of the way we manage the titleView there.
merge of master into nav_bar_no_drawrect
Made titleView animation duration available as an extern
Merge master into nav_bar_no_drawrect
Merge branch 'master' of github.com:Yelp/YelpKit into nav_bar_no_drawrect
Merge branch 'master' of github.com:Yelp/YelpKit into nav_bar_no_drawrect
Added an animated title change test
Added test image for animated test
Run for an internval instead of relying on an unset value
Merge branch 'master' of github.com:Yelp/YelpKit into nav_bar_no_drawrect
Added a const for animation duration.  Fixed selector not implemented issues
Merge pull request #2 from Yelp/nav_bar_no_drawrect

YKUINavigationBar no longer uses drawRect, and inherits from UINavigationBar