We need to create some linkage between an external library of material names, and thus densities and compositions. The ultimate goal of the work is to automate the generation of correlations between cubit group named entities and material compositions.

1. Investigate the PyNE material class to create a material library file or script
2. Create a sample problem that has the material library/script and the appropriate group names from this material library
3. Using the tagged geometry file and this material library script, produce an appropriate material composition for each