Add a TestRunExit, make sure cmdRun returns after process dies
Add a stdincloser to container.Attach in order to close the client connection when needed
Close the broadcaster once they are not needed anymore
Discarding errors in CmdRun
Bumped version to 0.1.2
Simplified Graph.Delete() - no more garbage collecting, just atomic deregister then os.RemoveAll
Merge remote-tracking branch 'origin/328-i_o_error_uncloced_connection-fix'