BUG: Fix unhandled divide-by-zero errors and invalid values in tests. Add some tests to check that divide-by-zero errors are raised when desired.
BUG: Fix unhandled divide-by-zero errors and invalid values in tests. Add some
tests to check that divide-by-zero errors are raised when desired.

git-svn-id: 77a43f9646713b91fea7788fad5dfbf67e151ece@8249 94b884b6-d6fd-0310-90d3-974f1d3f35e1

teoliphant/numpy-refactor,teoliphant/numpy-refactor,teoliphant/numpy-refactor,jasonmccampbell/numpy-refactor-sprint,jasonmccampbell/numpy-refactor-sprint,teoliphant/numpy-refactor,teoliphant/numpy-refactor,Ademan/NumPy-GSoC,jasonmccampbell/numpy-refactor-sprint,Ademan/NumPy-GSoC,jasonmccampbell/numpy-refactor-sprint,Ademan/NumPy-GSoC,Ademan/NumPy-GSoC