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.
That's what it says in the README from telepathy-gabble:

>At build time, it also requires:
>  GNU make <http://www.gnu.org/software/make/>
>  pkg-config <http://ftp.gnome.org/pub/GNOME/sources/pkg-config/>
> libxslt, xsltproc <http://xmlsoft.org/XSLT/>
> Python <http://www.python.org/>

I'm pretty sure it's just used to created and parse the GIR format from telepathy-glib.