Log Message:
Update gossip to 0.7.

News in 0.7:
============
* Fixes to the chat window (URL matching, clear chat)
* New application icon from Dan Taylor
* Chat window entry autoexpands instead of using a disclosure widget
* Store state of contact list (visibility, position and size) between
  sessions
* Don't show groups with no contacts
* Presence setting system greatly improved
* Edit groups support added
* Made the autoback timeout longer (30 secs)
* Better keynav support
* A couple of crash fixes
* Several smaller bugs fixed
* Updated and new translations (ca, cs, da, es, eu, it, ms, nl, no, pt,
  sr@Latn, sr, sv)