Added tests for coloring the hodograph by different variables
Added tests for coloring the hodograph by different variables

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