Added Job.set_owner() and Job.get_owner() methods to support "Job and Slave ownership" plugin.
I does not wrote unittests cause Job and Slave ownership plugin does not provide info in api/python url.
Merge branch 'master' of github.com:dkochetkov/jenkinsapi

* 'master' of github.com:dkochetkov/jenkinsapi:
  coding style errors has been corrected.
  Added Job.set_owner() and Job.get_owner() methods to support "Job and Slave ownership" plugin. I does not wrote unittests cause "Job and Slave ownership" plugin does not provide info in api/python url.