Swapped UITextAlignment for NSTextAlignment & added "text" property

First change is to get rid of the warnings since iOS6 deprecated UITextAlignment.
Second change is to give the developer more flexibility - can still set "value" as previously, but can also now set "text". Setting one will override the other, therefore the dev can change between them easily.

Bumped the podspec to 0.0.2 and have tagged the repo appropriately (I think!)