Bounding box of a layer does not get updated

[fzadrazil]

New layer is being created with the bounding box of [0, 0, 0, 0] and bbox doesn't get updated after pushing new features to the layer. Any layer should be probably created with bbox coordinates that cover the whole world and then updated on layer edits.

• Treat layers without any data (set world bbox), Set world bounding box on GeoServer layer if DB table is empty #166
• Update bbox on data change (PATCH Layer, WFS-T)
• Update layer thumbnail on data change (PATCH Layer, WFS-T), Refresh layer and map thumbnails #170
• Update map thumbnail on data change (PATCH Layer, WFS-T), Refresh layer and map thumbnails #170