deprecated method and replaced with one with options bit mask
Added ability to draw links normal or highlighted
Added contentImageWithBounds:options: method

This can be used to get an image for normal and highlighted hyperlink buttons.
removed text frame drawing on link buttons
[BREAKING] removed custom string drawing from DTLinkButton

Warning: this breaks the previous implementation approach to set attributedString and highlightedAttributedString properties. New new method is to set two different images for normal and highlighted, see DemoTextViewController implementation.
restored previous minimum hit size in demo