Remove too early instantiation of contentView.

This caused the contentView to be already instantiated in the awakeFromNib or init. We want to defer the creation as much as possible so that we can also consider contentInset of the underlying scroll view in the bounds of the content view
Added method to get current status of "draw debug frames"
Removed defunct debugFrames property on content view
Added method to get the current value of debug frame drawing from layout frames.
optimization to only call relayoutText on setting text  if there is a previous layout frame
Changed setFrame to only check for different size

Changing the frame origin should not trigger a re-layout
Merge branch 'master' of github.com:Cocoanetics/DTCoreText

Conflicts:
	Core/Source/DTAttributedTextContentView.m