+ General cleanup of package.py.
+ General cleanup of package.py.

LLNL/spack,krafczyk/spack,tmerrick1/spack,matthiasdiener/spack,matthiasdiener/spack,tmerrick1/spack,EmreAtes/spack,krafczyk/spack,LLNL/spack,TheTimmy/spack,EmreAtes/spack,EmreAtes/spack,EmreAtes/spack,tmerrick1/spack,TheTimmy/spack,iulian787/spack,EmreAtes/spack,lgarren/spack,LLNL/spack,krafczyk/spack,TheTimmy/spack,mfherbst/spack,LLNL/spack,matthiasdiener/spack,mfherbst/spack,matthiasdiener/spack,LLNL/spack,iulian787/spack,tmerrick1/spack,lgarren/spack,krafczyk/spack,skosukhin/spack,mfherbst/spack,skosukhin/spack,tmerrick1/spack,lgarren/spack,lgarren/spack,mfherbst/spack,iulian787/spack,skosukhin/spack,TheTimmy/spack,skosukhin/spack,iulian787/spack,skosukhin/spack,TheTimmy/spack,iulian787/spack,matthiasdiener/spack,krafczyk/spack,lgarren/spack,mfherbst/spack