Allow turning of trap_fpe in debug mode
closes #3595
Remove double underscore variable references from MOOSE
Add test for no-trap-fpe flag.
Merge pull request #3649 from shanestafford/allow_fpe_off_3595

Allow fpe off
Merge commit 'bf1d3a532dd9400f31b0589ee8caaab8df8e5648'