Add prefix to id of getContacts and possibly others

[demurgos]

The contacts returned by .getContacts should be prefixed by their type (as 8: for human users).

[mitchcapper]

Not sure if we want to extend this to other methods that return id's without being prefixed. Do we just assume a non-prefixed id is type 8?

[demurgos]

I think that we need more data about this. Its better to not prefix rather than incorrectly prefix by 8:. I don't know if it is possible or safe to guess the type.

By the way, it seems that a "prefixed" ID is called a "MRI" by Skype (M... Resource Identifier ? M could be related to "Model"). Maybe it would be good to clearly state when the argument or result uses (non-prefixed) IDs or (prefixed) MRIs because it is currently confusing.

[demurgos]

@mitchcapper
It's better to add the prefix everywhere. With the new contacts API (v2), Skype uses it as the only ID for the contacts.
We now only have {mri: "8:bob", ...} instead of the old {id: "bob", type: "skype", ...}.