Bug 1007932 send vcard in an MMS

Just a note that the region in smil means the block styling information for mms slideshow, so setting the same styling to text content and contact content seems a little bit wired(but this still able to display on other android message apps per my testing). Since contact or other type of ref attachment should not be able to display in slideshow, how about removeing the region attribute if the attachment type is `ref`? And we might need unit test for this.