replaced DTVersion with recommended method #646
Replaced DTVersion in DTAttributedTextCell #646
removed DTVersion in DTCoreTextFontDescriptor #646
cleanup
simplified DTHTMLWriter, use NSDictionary+DTCoreText methods for getting foreground and background Color. #646
Replaced DTVersion in unit test, #646
Replaced DTVersion in DTHTMLAttributedStringBuilder #646
Merge branch 'od/issue_646' into develop