Added support for truncation

DTCoreTextLayoutFrame - added truncation support w/ attributed truncation string

DTAttributedTextContentView - added flag to disable automatic height adjustment. This allow us to subclass, disable resizing, enable truncation, and have a DTAttributedTextContentView that behaves like a UILabel.

Change-Id: Ibb3231c3c58f2650f9358a5e8297ab45b7d792d6
Removed PayPal from readme
Merge pull request #275 from minorblend/imageCache

added image cache for the text attachments of image type
Merge pull request #274 from bkennyatmeetme/master

Truncation support so DTAttributedTextContentView subclasses can  used like UILabels
Added DTAttributedLabel, a truncating variant of DTAttributedTextContentView that behaves like a UILabel

Change-Id: I7f4e8967fa77ce8ac3e5db541fa385749e1b367b
Merge pull request #278 from bkennyatmeetme/master

Added DTAttributedLabel, a truncating variant of DTAttributedTextContentView
Merge pull request #277 from minorblend/modified_setFrame

run relayoutText only if frame size has been changed
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
fixed color problem on MacUnitTest
Implemented #ifdefs for OS_OBJECT_USE_OBJC

from iOS 6 and OSX 10.8 GCD objects (like semaphores) use ARC, this compiler flag adjusts the code based on whether or not the current minimum OS supports it
Fixed deprecated truncation constants

as of iOS 6.0 they have different names. There is a new function to convert to eliminate build warnings
Updated podspec for 1.2.0
Merge remote-tracking branch 'Cocoanetics/master'