Remove type_id arguments from Event::new and UIEvent::new.
auto merge of #1250 : Ms2ger/servo/event-new, r=jdm
Add some more Blob methods/types
auto merge of #1267 : evilpie/servo/blob, r=jdm

I was going to add the Constructor overload, but that requires implementing that fallthrough case in CGCase, which I didn't feel like doing. At least we can compile the dict now.
Make the HTML parser parse into the document rather than an element.

This removes the duplicate html element.