Better approach to the introductions GUI.

Conflicts:
	client/gui.go
Added UI elements for Introductions Message Compose and Send.
Joint effort by Jeff Burdges <burdges@gmail.com> and Ram Vedam <rvedam@gmail.com>
Refactor composeUI into composeUI and newDraftUI.  This'll simply creating messages to specific recipiants and makes the code more redable.
Actually fill in the Dark Web of Trust values
We should support goprotobuf as well as gogoprotobuf
Rebuild using goprotobuf
We should call 	c.newKeyExchange  outside  c.beginPandaKeyExchange  if we want to use it in the GUI.