Added LayerMetadata-information to MapLayer class
Extended the MapLayer Entity with a set of key-value-based metadata records
Merge pull request #18 from weskamm/layermetadata

Added LayerMetadata-information to MapLayer class
Added User Entity to MapLayer
Added User including getters and setters to the MapLayer Class in order to get 'granted Users' for a MapLayer instance
Merge pull request #19 from weskamm/maplayerusers

Added User Entity to MapLayer