Respect the attributedText property's 'copy' attribute.

attributedText is defined as a copy accessor, so we need to `-copy`
the NSAttributedString's value in `-setAttributeText:`.
MIT License header was missing in some files
Merge pull request #108 from jparise/copy-accessor

Respect the attributedText property's 'copy' attribute.
Fix #107 in Demo project : processing markup in attributed string AFTER setting the font of the whole string (to avoid font and color set by markup to be overridden by the following "setFont:" and "setTextColor:")
Changed colors in UITableView Demo project to show more evidently the formatting
Detect bold variant for the ".HelveticaNeueUI" font — It can't find its bold variant by code, but as it is a widely used font (default font in IB) it needed a special hack
Added OHParagraphStyle which allows you do modify a lot of paragraph attributes from line spacing and paragraph spacing (fix #41) to line indentation (fix #109)
Updated Demo Project to demonstrate new OHParagraphStyle features
Updated README for 3.3.0 (with example usage for OHParagraphStyle, firstLineHeadIndent and lineSpacing)
Updated README for 3.3.0 (with example usage for OHParagraphStyle, firstLineHeadIndent and lineSpacing)
Added beginEditing/endEditing to methods modifying multiple attributes at once (to optimize consolidation and observers and avoid performing them each time)
added "setTextItalics:" method + support in Markup Parsers
Easier and better way to #import <OHAttributedLabel/OHAttributedLabel.h> headers in your app (sorry that changed again, but this time it should be cleaner and work for all possible configurations)
Make it possible to activate links in the sentence on touchBegin, as well as touchEnd.
Merge pull request #121 from Infiniverse/master

Ability to activate a link on touchBegin as well as touchEnd.
* Optimization of @infiniverse code for new "catchTouchesOnLinksOnTouchBegan" property.
* Added depreciation on old addCustomLink: and removeAllCustomLinks methods (use NSAttributedString's setLink:range: instead)
Added TOC to README
Activated some new conversion warnings and fixed them (Xcode 4.6 / #122)
Fix small issue in commit 091bc28019fa3eae8ea55d978a03384f277eff1f for hack on font variants
Fix issue in commit 091bc28019fa3eae8ea55d978a03384f277eff1f for hack on private font variants