UITextView utilities, bug fixes, existingObjectWithID:

[FIXED]     Don't rely on keyWindow: It refers to disappearing popups, too.
[ADDED]     PearlSizedTextView: A UITextView with an intinsicContentSize.
[ADDED]     -[UITextView textAttributes]: NSStringAttributes from a text view's plain attributes.
[ADDED]     -existingObjectWithID:inContext: Convenient lookup of managed objects from a context.
[IMPROVED]  stra, strra: convert any object cleverly into an attributed string representation adding attributes.
Merge branch 'master' of git://github.com/Lyndir/Pearl

Conflicts:
	Pearl-UIKit/PearlOverlay.m