Merge pull request #26 from willtemperley/jts-api

Basic attempt at JTS integration
relocated to new package, keeping shared for stuff that as also usable for client side integration

Related to issue #18
geometry collections now added in groups
updated dev version
Improved automatic integration test

Now all test UIs are opened with debug mode and failed if errors are displayed.
removed obsolete import
added first versions of field implementations
added overridden JTS typed method for zoomToExtent

Related to #18
Improved JTS support and added zoomToContent to LMap
removed obsolete imports
Improved JTS Field implementations

 * Added LinearRingField
 * Added test
 * Added convenience constructors
removed obsolete import
Improving JTS fields

 * added some documentation
 * added Configurators and a static “global configurator”
 * added proper OSM attribution string
minor cleanup
Updated version to next development cycle
Added sanity check to avoid NPE when called for empty maps
updated version to next development cycle