FIX small crash when no font was defined in the AttributedString and we try to set some text in bold.

Note: Despite being related to fonts, this commit does NOT fix issue 89 (which is due to an Apple bug)
Added some basic HTML and markup tag support to make the creation of an NSAttributedString easier
(request #88)
Improved sample for markup tags
Updated README to tell about the basic HTML/Markup support using OHASTagParser classes
Updated README to tell about the basic HTML/Markup support using OHASTagParser classes
Fixing #90 and Build Paths in project so that inclusion of headers works in all cases.
Note: now headers should be #imported using <OHAttributedLabel/header.h> in the application project to work (this is quite more clean anyway)
Updated README instructions for the new include path fix (#90)
Fixed bug in sizeThatFits: when called in the same runloop as the one in which you changed the attributedText (it would compute the size of the previous text then)
Renamed Parser classes with more logic names
Fix #93
Fixed crash in MarkupParsers when empty match (if no text between opening and closing markup)
Cleaning MRC vs. ARC code with macros to avoid #if/#else/#endif and make it more readable
Added possibility to set bold style for links
Typo fix
Updated README to fix class name typos
Tiny typo fix in comments
Typos again
Updated README
README: more details about header paths / #90
CF_OPTIONS -> NS_OPTIONS