Connects: https://github.com/geotrellis/maml/issues/116 - [x] Publish maml - [x] Bump maml dependency once feature is available and published - [x] Test feature in configuration file through WCS layer - [x] Add default value for TargetCells: All cells is the default in GT proper. - Should it be default in MAML case classes as well as JSON parsing?