EDocument UNECE Module
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The module adds many codes from the UNECE:

    * `Recommendation N°. 20 Codes for Units of Measure Used in International
      Trade
      <http://www.unece.org/tradewelcome/un-centre-for-trade-facilitation-and-e-business-uncefact/outputs/cefactrecommendationsrec-index/list-of-trade-facilitation-recommendations-n-16-to-20.html>`_

    * `5153  Duty or tax or fee type name code
      <http://www.unece.org/trade/untdid/d16b/tred/tred5153.htm>`_

    * `5305  Duty or tax or fee category code from
      <http://www.unece.org/trade/untdid/d16b/tred/tred5305.htm>`_
