use DataPackage for documenting Layers

[bbest]

Incorporate R and Python packages for this simple data package format.

This limitation of 10 characters for shapefiles is uber lame, eg README.md explaining Antarctic specific set of shapefiles here:

\\neptune\data_edit\git-annex\Global\NCEAS-Regions_v2014\data

• antarctica_ccamlr_alleez_gcs.shp: CCAMLR regions before being clipped by EEZs
  • areaorig -> area_orig_km2
• antarctica_ccamlr_ohi2014_gcs.shp: CCAMLR regions after being clipped by EEZs with the following fields explained:
  • areaorig -> area_orig_km2
  • area_km2
  • area_pct_o -> area_pct_orig: area_km2 / area_orig_km2 * 100

[bbest]

moved to https://github.com/OHI-Science/ohicore/issues/41