Closes #246 #284 #285 #288 #289 #291 - Improved Fluo cluster management.

Pull request for  #246 #284 #285 #288 #289 #291
> See the existsButNotRunningMsg(). Users are told to run 'fluo init'. 

Ok. Under what circumstances can a user get into this situation?  If yarn is restarted or stopped (while fluo yarn app is running) would it cause this situation?