moved cycluscore -> cyclus and fixed some nuc data initialization issues.
Merge pull request #223 from scopatz/rm-core

moved cycluscore -> cyclus and fixed some nuc data initialization issues
companion to cyclus/cyclus#861
Merge branch 'gidden-rbptr' into develop
companion to #863, also cleans up some test memory issues
actually using usings
Merge branch 'gidden-rbp2' into develop