Progress toward mesh to mcnp geom.
Tweaks to material writting methods for MCNP and ALARA to return strings.
Fixed mcnp and alara Material methods naming.
Reimplimented write_mcnp and write_alara and corresponding tests.
Merge pull request #283 from elliottbiondo/mat_str

Material methods to return MCNP and ALARA strings.
Merge branch 'staging' of https://github.com/pyne/pyne into mcnp_mesh
Working version of mesh_to_geom.
mesh_to_geom tests written and passing.
Added example of pyne.ace usage in an ipython notebook.
Fixed doc string, eliminated superfluous len() calls.
Removed accidently committed change.
Merge branch 'mcnp_mesh' of https://github.com/elliottbiondo/pyne into elliottbiondo-mcnp_mesh
fixed parameters typo
init'd cli sub-package
sleepy
created origen nuclide data sets.
tape9 cli runs!
added WIMSD fission product yields to nucdata
added fpyield() function to pull fission products out of the db
Merge pull request #287 from scopatz/o2t

Generate Decay Portion of ORIGEN v2.2 TAPE9 file from ENSDF