Increased min required versions for podspec
Merge branch 'develop' of github.com:Cocoanetics/DTCoreText into develop
Merge branch 'develop'
Adds support for arbitrary HTML attributes to NSAttributedString+HTML

DTHTMLElement now keeps HTML attributes. These attributes are written out, with a
few exceptions, by DTHTMLWriter. The class attribute is only written if DTHTMLWriter
is asked to generate an HTML fragment so as not to stomp on the class attribute it
generates.