Fixed bug with setting font-name without setting font-size

This was proposed by @basitali in https://github.com/tombenner/nui/pull/70
Removed unused fontSizeProperty variable in NUILabelRenderer
Add support for styling UIControl
Removed the UIControl from the Storyboard for aesthetic consistency
Removed Control from the default NSS
Added Control's supported properties to the README
Add support for shadows to View, Control, Button, Label and TextField. Refactored border rendering.
Fix rounded button rendering
Making the demo app work better on iOS 5.1
Merge pull request #74 from aleph7/shadows

Shadow support
Used setMasksToBounds instead of adding a rounded corner to the gradient layer in UIButton

The previous approach unfortunately doesn't work for background images
Replaced a tab with spaces
Alphabetized content-insets for UIButton in the README
Alphabetized the shadow-* properties in the README and replaced shadow-offset's Size type with Offset
Merge pull request #77 from christophercotton/ios5changes

Making the demo app work better on iOS 5.1 for issue #64
Fixing crash if the UITableViewCell was not using the textLabel or detailTextLabel, and auto update is on
Fix buttons so that they can have both corner-radius and shadows
Merge pull request #79 from aleph7/button_corners_and_shadow

Fix buttons so that they can have both corner-radius and shadows
Replaced tabs with spaces in previous commit
Merge pull request #78 from christophercotton/uitablecrash

Fixing crash when using UITableViewCell