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
Merge remote-tracking branch 'upstream/staging' into staging
Merge remote-tracking branch 'upstream/staging' into staging
Merge remote-tracking branch 'upstream/staging' into staging
Merge branch 'staging' of https://github.com/pyne/pyne into mac_rpath
Merge remote-tracking branch 'upstream/staging' into staging
Can now make meshes with no material library. fixes #382.
Use rxname for half_life database generation
Merge upstream staging
use rxname instead of string in decay data
update gamma ray test
added mesh iter alteration for no mats
Merge branch 'staging' of github.com:pyne/pyne into big-mesh
subsume half_life data into level data
build level data first and use the C++ interface to speedup decay parser
bugfixes
remove old ensdf tools and tests

Also improve branch ratio behavior in edge cases
potential fix for lib python.