Merge pull request #110 from kwilcox/master

Improvements
Merge pull request #112 from kwilcox/master

Cleanup and front-page redesign
arctan2 needed here, or you flip signs.
Correct direction calculations
Round date2num output as they are floats, fix off-by-one errors in getFeatureInfo
ignore unversioned database.
Merge pull request #115 from brandonmayer/ignore_db

ignore unversioned database.
added jsonfield requirement and json field column to dataset model.
Allow json field to be null.
removed spaces
adding jsonblob migration file
renamed jsonblob to json
Merge pull request #118 from brandonmayer/add_json_field

Add json field to wms_dataset table