Added builds on linux and osx.
Added echo of os and python version.
Changed to make Linux the default OS.
Added docstrings for __init__ of grids.
Changed Grid creation to show __init__ docstrings.

Changed
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* For Grid Creation section, document each grid's __init__ section. This
  works better when using numpydoc. With numpydoc, if we were to document the
  classes here, a long list of each classes methods would show up.
Changed to use scipy theme.
Merge pull request #40 from mcflugen/add-new-sphinx-theme

Changed to use sphinx scipy theme