travis fix, add toctree
travis fix, add toctree

jrleeman/MetPy,dopplershift/MetPy,ShawnMurd/MetPy,ahaberlie/MetPy,ahill818/MetPy,deeplycloudy/MetPy,Unidata/MetPy,Unidata/MetPy,dopplershift/MetPy,ahaberlie/MetPy,jrleeman/MetPy