Update travis config to point to Cython at b6509bf791bfe44abbbaa957ae530e5910815dfd.
Update travis config to point to Cython at b6509bf791bfe44abbbaa957ae530e5910815dfd.
cython-testbed/pandas,cython-testbed/pandas,cython-testbed/pandas,cython-testbed/pandas,cython-testbed/pandas