pyne/pyne — pull request #283 by elliottbiondo (2014-02-04 20:12:11+00:00)
Title: Material methods to return MCNP and ALARA strings.

This PR tweaks existing methods that write MCNP and ALARA ```Material``` representations to a supplied file. Instead, they now return strings. This is necessary for ```mesh_to_geom``` functionality in ```mcnp```.