Use a more secure JSON instead of ad-hoc python eval (ON-202)
Merge pull request #26 from opennode/oms-202

Use a more secure JSON instead of ad-hoc python eval (ON-202)
Implement a better simpler asynchronous Twisted-subprocess-based Salt executor and remove now-obsolete ones (OMS-205)
Add missed constructor and run arguments (OMS-205)
Cleanup and add environment settiing argument to spawnProcess (OMS-205)