Delete the multiple client's function on the MavLinkService
Changing the way the MAVlink service and client comunnicate.
Re-enable the mavlink connection on the service. The connection always exist with the service.
Create a way to autodestroy the service when it can't aquire a connection.
Deleting unused method on the MAVLinkConnection.

The state of the connection is now handled by the Service
Merge pull request #97 from arthurbenemann/issue91

Fix #91 and #35. Better structure for the link between the app, the service and the MAVlink connection.
Preparing for release v0.7.7