move atomic data to nuc_data.h5
Add basic C++ interface to atomic data
Add python interface to x-ray data
Add direct computation of X-ray data from ensdf
remove obsolete code in ensdf.py
lowercase and tests
Merge branch 'atomic' of https://github.com/crbates/pyne into crbates-atomic
Merge branch 'staging' of github.com:pyne/pyne into staging