Endianness Issue with SciPy's FFT

[krischer]

SciPy's FFT cannot deal with big endian floats. We'll just have to enforce certain flags when passing to it.

Code snippet to reproduce:

import obspy
import numpy as np

tr = obspy.read()[0]
tr.data = np.require(tr.data, dtype=">f4")
tr.resample(10)

Came up on the mailing list: http://lists.swapbytes.de/archives/obspy-users/2014-December/001602.html

[QuLogic]

Mentioned at the end of #913, too.