BUG: Silence annoying dateutil warnings
DOC: Add basic docstring for CSAGStationReader
ENH: Auto-replace CSAG no-data values with np.nan
ENH: Add a point in polygon routine
BUG: Make sure CSAG reader assigns np.nan to precip data
BUG: Force a list copy - reverse method changes list *in place*

* Repeated calls to this function caused a flipping behaviour in the
  colormap returned when `reverse` is True.
ENH: Printing options context manager for numpy arrays