Add directions for linking to CoreParse

Add directions for linking to CoreParse when not using CocoaPods.
Fix iOS7 deprecation in NUITabBarItemRenderer
Changing nuiClass after a control is moved to the window currently has no effect. This commit fixes this issue.
Support media queries
Listen for status bar orientation notifications instead of device orientation notifications
Remove registered objects list, just walk all visible views

In my timing tests, walking the visible views was about the same amount of time as using registered objects. Since using registered objects was causing memory leaks and did not handle all stylesheet changes, it made sense to remove them.
Update README with information about @media queries
Merge pull request #200 from phatmann/patch-1

Add directions for linking to CoreParse
Merge pull request #201 from phatmann/apply-nui-class-change

Apply nuiClass change immediately
Merge pull request #202 from phatmann/fix-io7-deprecation-in-uitabbaritemrenderer

Fix iOS7 deprecation in NUITabBarItemRenderer
Merge pull request #203 from phatmann/media-queries

Media queries
Version 0.5.0
Merge remote-tracking branch 'tombenner/master'

Conflicts:
	NUI/Core/NUIRenderer.m