v0.29.0

Fixed

• CallPeak issue where mergePeak function would fail if no normalized bigwigs were
  included on the command line (they are optional).
• Issue in normalize code that broke getTrainSet. np.array_split not only splits an
  array, but also secretly changes the types in the array if it's heterogenous. Some ints
  were being converted to strings, and this made np.arange (and the author) very sad. Fortunately,
  our custom arraySplit code does no such nonsense.
• Issue in normalize code with getScaler. It expected the input to be a nx4 array, but it was being
  passed (correctly) an nx2 array.
• Adds CRADLE/CalculateCovariates/covariateUtils.pyx to setup.py list of ext_modules

Changed

• Use np.int_ instead of np.long. np.long has been removed and the values should be nowhere near the
  max value of an int_ (an int64).