Added support for an OSM based map view.

Uses the Leaflet api.
Changed table view column headings.

From Item, Relation, Value
to Subject, Predicate, Object.
Added grouping items in mapview using colored pins
Use newer library version.
Fixed accordion showing empty first div
Merge branch 'develop' of devhub.openlinksw.com:/opensource/html5pivotviewer into develop
Modified demo file to work with new libraries.
Modified collection loader

It now handles realted collections dymanically generated from
sparql.
Disply the collection is empty messages.

Before this change it would be immediately obscured by the
deepzoom collection empty message.
Fixed bug with the Extension element in Safari
Merge branch 'develop' of devhub.openlinksw.com:/opensource/html5pivotviewer into feature/osm_support

Conflicts:
	Makefile
	src/pivotviewer.js
	src/views/mapview.js
	src/views/tableview.js
Added support for OpenStreetMap.
Merge branch 'feature/osm_support' into develop
Mapview will now display geometries

You can now specify a geometry in a specially
named facet using WKT and it is displayed on the
map
Fixed type
Fixed problem with tooltips in tableview
Added a QRCode bookmark.
Fixed timeline bug
Added the option to add WMS overlay to the map.

The base url of the WMS server is supplied without the bbox option
when calling PivotViewer. e.g.
MapOverlay: http://maps.communities.gov.uk:8080/geoserver/eafloodareas/wms?service=WMS&version=1.1.0&request=GetMap&layers=FloodAlertsWarnings&styles=&srs=EPSG:4326&format=image%2Fjpeg
Fixed typo - should be isNaN not NaN