Support numpy 1.9

Numpy 1.9 is out now. It does not include `__numpy_ufunc__`, so should be relatively easy to support. Am not quite sure what needs to be done to start testing: change `.travis.yml` and upload new version to travis?
@astrofrog?
wouldn't it make more sense to just silence the deprecation?

@seberg given this use case I think it might be better to remove this deprecation, or raise immediately the error without deprecation cycle, thoughts?