Changed photon source to hdf5 function to include volume index
Finished photon source h5 to mesh function, needs testing.
Tests pass for photon_source_h5_to_mesh
Made tests more interesting, some cleanup.
First round of changes per Anthony's suggestsions.
Changed photon_source_hdf5_to_mesh to accomodate all nuclide forms supported by PyNE.
PEP8 and other minor changes.
Eliminiated if-construct in favor of introducing new variable in alara tests.
Merge branch 'alara' of github.com:elliottbiondo/pyne into staging