Providing document type by hand

[lukejagodzinski]

Hi, I have CCDA documents that do not include <templateId> tag which is not required by a standard (from what I've read). So I would like to have a way of providing document type by hand. We could use the second arguments of the BlueButton function which is already defined as options. So here:

bluebutton.js/lib/bluebutton.js

Line 23 in 5d0ee7e

switch (type) {

we could check if the opts.type is provided and use it. What do you think? I can create PR for that.