Let GridInfoServlet have its context configured via URL params

For debugging/experimentation.
Fix "KML" link; fetch shape via "shape" field; not any other
Update data files to use WKT syntax; not old legacy.

Copied from Lucene spatial test data where I did this.
GridInfoServlet: only do WKT; and return from errors better
schema.xml Spatial field types shouldn't store=true (redundant)
KMLHelper: compatibility with Spatial4j 0.4
Configure SpatialDemoURP 's ctx in solrconfig.xml

And wrap ShapeCollection with a ShapeWrapper to sneak by SolrInputField multivalue issue SOLR-4329
SLF4J should be compile dependency for LSE (& spatial demo)