Update WYPopoverController.m

Fixes unused function warning in Xcode.
Fix navigation controller background problem

Navigation controller in wypopover does not redraw its background after
view transition. Add setNeedsDisplay in end of -
(void)positionPopover:(BOOL)aAnimated
Enable accessibility for popover view
Merge pull request #8 from joelfischerr/master

Update WYPopoverController.m
Merge pull request #9 from hubertwang/master

Fix navigation controller background problem
Addressing UIViewController(popoverController's contentViewController) was deallocated while key value observers were still registered with it #5
Merge pull request #10 from jinthagerman/master

Enable accessibility for popover view
Bumping version
fixed the bug connected with removing observer twice
why 100? this breaks constraints in the controller
Merge pull request #11 from eugenepavlyuk/master

fixed the bug connected with removing observer twice
Updating podfile to 0.3.2
Making contents of popover controller accessible
Bumping podfile
Added an option to disable tint color adjustment on views behind the popover.
Updated the README
Get rid of touches swizzling
More accurate tapOut declaration and call
Respect navigation bar hidden property
Added support for rounded arrows