Fixing unorderable types error that occurs in nuc_data_make
Revert "Fixing unorderable types error that occurs in nuc_data_make"

This reverts commit aec7c42feba894e049c787c944ca4088312009fd.
#537 - fixes type error
Update data.pyx
Merge pull request #545 from jdangerx/staging

#537 - fixes type error
Merge branch 'staging' of https://github.com/pyne/pyne into develop