Twitux 0.60 released

NEW in 0.6:

- Fized #1778008, Main window does not resize.
- Fixed #1773179, UI doesn't remember position.
- Fixed #1775052, add spell checking support.
- Fixed #1775053, add NetworkManager support.
- Fixed #1777286, option to log in on start up.
- Added gnome-keyring support.
- Removed trademarked icons, and replaced with icon with CC license.
- Install theme friendly icons. http://live.gnome.org/GnomeGoals/AppIcon
- Simplify the support of a new language for translators. http://live.gnome.org/GnomeGoals/PoLinguas
- Major rewrite of client.