store the bus of the Connection as an attribute so we don't have to pass the bus to request_channel
store the bus of the Connection as an attribute so we don't have to pass the bus to request_channel

epage/telepathy-python,freedesktop-unofficial-mirror/telepathy__telepathy-python,detrout/telepathy-python,PabloCastellano/telepathy-python,max-posedon/telepathy-python,epage/telepathy-python,freedesktop-unofficial-mirror/telepathy__telepathy-python,max-posedon/telepathy-python,detrout/telepathy-python,PabloCastellano/telepathy-python