Update WebgisInit.js

Add OSM base layer (Mapnik, cyclemap and MapQuest)
Update GlobalOptions.js

Add OSM base layer (Mapnik, cyclemap and MapQuest)
Update style.css

OSM attribution
Merge pull request #103 from rmarzocchi84/patch-1

Update WebgisInit.js
Merge pull request #104 from rmarzocchi84/patch-2

Update GlobalOptions.js (OSM)
Merge pull request #105 from rmarzocchi84/patch-3

Update style.css (OSM)
fix OSM overview layer
refactor WMTS base layers
- show WMTS layers in normal layer tree instead of separate base layers group
- feature info, legend and metadata on original WMS layers
- apply min/max scale from WMS layer to corresponding WMTS layer
- permalink: WMTS layers included in visibleLayers

Development funded by Kanton Solothurn
refactor WMTS base layers: move WMTS configuration to GISProjectListing.js
Development funded by Kanton Solothurn
Merge remote branch 'upstream/master' into aproach