Updated DTCoreText to v1.4

Hi there..

I would like to push this to a development branch, if you are interested in working together on updating your module for DTCoreText 1.4.
Its has many new features that quite nice. 
Especially the spreadsheet, video player

see here: http://www.cocoanetics.com/2013/04/rich-text-update-1-4/ 

I should say: this PR is not fully working. Im getting an error on local images:
*** Assertion failure in -[NSHTMLReader _addAttachmentForElement:URL:needsParagraph:usePlaceholder:], /SourceCache/UIFoundation_Sim/UIFoundation-78/UIFoundation/TextSystem/NSHTMLReader.m:1478


Would you be interested in this update?