0.4.0

• Updated the data model for keywords. The keyword attribute
  can contain strings, as it could previously, or instances of
  geometamaker.models.Keyword.
  #119
• Updated the data model for storing coordinate reference systems.
  A crs attribute is now an instance of
  geometamaker.models.CoordinateReferenceSystem. #88
• Added geometamaker.load which can read a metadata YML file and
  instantiate a resource of the appropriate type. This is faster than
  calling geometamaker.describe on the original dataset, but load
  will not keep the metadata in sync with properties of the dataset while
  describe will. #111
• Fixed a bug where describing a CSV that was encoded with a UTF-8
  byte-order-mark would raise a KeyError when accessing the first field. #143