title: Python Type_Error: unexpected keyword argument
body: <p>Hi guys I installed a package and when I tried to use the functions, it said  "TypeError: <strong>init</strong>() got an unexpected keyword argument 'coordinates_type' "</p>
  
  <pre><code>OK = OrdinaryKriging(data[:, 0], data[:, 1], data[:, 2], variogram_model='power', verbose=False, enable_plotting=False,coordinates_type='geographic')
  z, ss = OK.execute('grid', gridx, gridy)
  </code></pre>
  
  <p>Here is the source code for the function</p>
  
  <pre><code>def __init__(self, x, y, z, variogram_model='linear',
               variogram_parameters=None, variogram_function=None, nlags=6,
               weight=False, anisotropy_scaling=1.0, anisotropy_angle=0.0,
               verbose=False, enable_plotting=False, enable_statistics=False,
               coordinates_type='euclidean'):
  </code></pre>
  
  <p>This error only happened with argument coordinates_type, and I had the latest version of the package.</p>
  
  <p>Thanks in advance</p>