Support input accessory auto-update and orientation change
Add image properties to UIButton.

Based on code from pull request #173. Also fixes typo for `text-shadow-color-selected-highlighted` property.
Add selected-disabled for all relevant properties
Merge pull request #212 from phatmann/text-transform

Add text-transform property to UILabel and UIButton
Merge pull request #214 from phatmann/font-from-settings

Add standard way to get font out of NUISettings.
Add basic support for styling UITextView
switch header/main code in text view support.
Add padding to TextView
Use correct utility methods and constants
Use helper methods for font-size and font-name styling
Merge pull request #215 from phatmann/move-init-call

Move NUISettings init call to the app delegate
Merge pull request #194 from substantial/uitextview

Styling support for UITextViews
Merge pull request #216 from phatmann/support-input-accessories

Support input accessory auto-update and orientation change
Merge pull request #219 from phatmann/button-image

Add image properties to UIButton.
Merge branch 'upstream-master'

Conflicts:
	NUI/Core/Renderers/NUIButtonRenderer.m
	NUI/Core/Renderers/NUITextViewRenderer.m
	README.md