Introduce DTDefaultFontName to specify font name next to DTDefaultFontFamily
Check for RGB
Fixed RGB issue for background css attribute.  Fix tests for textBackgroundColor and adding test for testBackgroundRGB.
Remove NSLog from testing
Test DTDefaultFontName option
Adds invalidateIntrinsicContentSize to setAttributedString: to support autolayout
Adds invalidateIntrinsicContentSize to the other setters that are able to change the contentSize
Merge branch 'develop' of https://github.com/krzak/DTCoreText into krzak-develop
Merge branch 'develop' of https://github.com/lucabartoletti/DTCoreText into lucabartoletti-develop
Merge branch 'krzak-develop' into develop
Merge branch 'lucabartoletti-develop' into develop