Add Telepathy related formulas (new formulas)

This branch adds the formula for  [Telepathy](http://telepathy.freedesktop.org/wiki/) and some [components](http://telepathy.freedesktop.org/wiki/Components/) that make it useful.

It adds these formulas: 

* telepathy-glib: main library
* telepathy-gabble: xmpp
* libnice: gabble dependency
* telepathy-idle: irc
* telepathy-mission-control: an Account Manager and Channel Dispatcher implementation, which stores accounts and coordinates the launching of connection managers and clients.
Ah, okay.

Do you know what version of python is required? This might be a case where the OS-provided libxslt and python may be enough, especially since it's not building python bindings.