look for errors only when job has failed [fixes #63533638]
Merge pull request #98 from mozilla/fix-story/63533638

look for errors only when job has failed [fixes #63533638]

this looks great.  I paused thinking if there were more cases to skip error parsing than just ``passing`` but pending and running won't have logs yet, so it will skip those anyway, and all the others are some kind of error, possibly even restarted ones.  Great catch!!
fixed 'guids' KeyError bug
updated manage.py commands
merge master and fix conflicts