Fix cmake rpath settings on mac
some e's somehow slipped through and were not converted to np.e
Merge remote-tracking branch 'upstream/staging' into staging

Conflicts:
	pyne/endf.pyx
Remove level hack in half_life()

Also skip over unused datasets and use direct float conversion of
energy level.
constrain level continuation parsing so unknown br's aren't returned
get rid of unused _level_regex and refactor _level_regex2 to _level_regex
remove duplicate levels in half_life() test
return keV instead of MeV from level_record
number levels by energy not by metastable state number

Also update tests accordingly
fixes to origen_data for updated level record parsing

adds state and fixes the test to check for levels in keV not MeV
Add final ensdf record parsers
Progress toward mesh to mcnp geom.
I searched and replaced all molecular_weight and replaced them with molecular_mass
updating comments
updating comments and adding back liscense.txt
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.
Merge remote-tracking branch 'upstream/staging' into staging