ENH: Update Skew-T for matplotlib 2.0 (Fixes #257)
ENH: Update Skew-T for matplotlib 2.0 (Fixes #257)

With matplotlib 2.0, when the range of a log plot is less than a decade,
like on a skew-T from 1000 to 100 mb, it will add minor log-spaced
ticks. We don't want that, so force the ticks to a null format.

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