Fix cmake rpath settings on mac
Merge branch 'staging' of https://github.com/pyne/pyne into mac_rpath
Use rxname for half_life database generation
Merge upstream staging
use rxname instead of string in decay data
update gamma ray test
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
Added aallzzzm function to nucname.  Also added documentation to other various nucname files doccumenting additions
Fixed line spacing issue in nucname.pyx
rename rx's to python friendly names
use unsigned int for rx_id's
remove commented out maps
make sure decay constant is a valid number
Changed name from aallzzzm to zzllaaam
Removed unnessesary case checking
Removed unnessesary comments and changed naming issue
default to metastable id in half_life functions