Raise exception when running tests inside IPython.
Make tests pass on Scipy 0.12.1
Merge pull request #2686 from mdboom/modeling/scipy-0.12-tests

Make tests pass on Scipy 0.12.1
Merge pull request #2684 from mdboom/testing/warn-when-in-ipython

Raise exception when running tests inside IPython.
Added a changelog entry for #2684, which seemed worthwhile.