Use index.values with numpy.repeat

The interaction code was calling np.repeat with a Pandas Index,
which was causing an error further in. Passing the Index values
seems to fix things.

There was a try/except block wrapping this call.
I took it out because it prevented diagnosing the problem.
Drop the patsy_patch

As of version 0.3.0 patsy includes a fast path for skipping
NA detection of boolean arrays, which is what our patch added.
That's the version of patsy on conda now, so I think we can
stop monkeypatching patsy.
Merge pull request #123 from synthicity/index-repeat-bug

Bug Fixes