Add support for levels with no GS info
Add special state information to level list
Use special state information in gamma assignment
Merge branch 'staging' of https://github.com/pyne/pyne into levelx
Add tests and a bug fix
Merge upstream staging
python3 fixes for zzllaaam and special levels
Merge branch 'levelx' of https://github.com/crbates/pyne into crbates-levelx