Merge pull request #28 from spilgui/master

	 Update error message when job does not start to be more verbose
On ping response, send back the version of the worker and the number of concurrent jobs.
Merge pull request #29 from brocaar/worker_info_in_ping_response

On ping response, send back the version of the worker and the number of concurrent jobs.
MAke sure the shebang line does contain a shebang
fool proofing popen by using shlex
Merge remote-tracking branch 'spilgames/master'
no shebang unit test