Add setup.py for installing.
Add setup.py for installing.

git-svn-id: acf0ef94bfce630b1a882387fc03ab8593ec6522@18 150532fb-1d5b-0410-a8ab-efec50f980d4

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