Added download of denkmal.geojson
Added classpath to Ext.ux

This allows the sencha build process to recognize plugins that are
stored in /ux in the Ext.ux namespace
A complete new build (testing, production)
Add GeoJSON converted from GIS-ZH as a layer to the map
Document how to convert GML to GeoJSON
Merge pull request #3 from denkmap/add-denkmal-geojson

Add Denkmal WFS as GeoJSON to the map