ewmcorr - Input arrays must be of the same type! using numpy arrays
I am trying to use ewmcorr on a numpy array:

`rand_arr = np.random.random((50, 50))`
`test_corr = ewmcorr(rand_arr, span=10)`

and I get the following Exception:
`Exception: Input arrays must be of the same type!`

numpy arrays are acceptable arguments, I'm unsure why it is not working.
