Comment out mistral task on travis - this task has been broken and not working for many months already.
Comment out mistral task on travis - this task has been broken and not working
for many months already.

Plexxi/st2,Plexxi/st2,tonybaloney/st2,nzlosh/st2,StackStorm/st2,Plexxi/st2,StackStorm/st2,nzlosh/st2,peak6/st2,StackStorm/st2,nzlosh/st2,StackStorm/st2,tonybaloney/st2,nzlosh/st2,Plexxi/st2,peak6/st2,peak6/st2,tonybaloney/st2