0.84/Shell refactoring

Actions

• Switch to GConf to store the user profile. (erikos)
• move the matchbox start and the upcoming one of the speech server to the session management

| Why we can't start the speech server on demand? (using dbus activation). --marco

Plugin systems

• http://trac.edgewall.org/wiki/TracPlugins
• http://www.djangoproject.com/documentation/forms/
• http://twistedmatrix.com/projects/core/documentation/howto/plugin.html
• http://twistedmatrix.com/projects/core/documentation/howto/choosing-reactor.html