renamed rdfextras_web => rdflib_web
whitespace gardening
Flask Blueprints for endpoint/lod app and Flask 10 compatability

In Flask 10, overriding an existing url route is an error and having the
lod app override index no longer worked. I've made both apps into Flask
blueprints, this also allows them to easily be integrated into other
flask apps, see http://flask.pocoo.org/docs/blueprints/

Another minor change in Flask 10 is that sessions are now serialized as
JSON, and python sets are no longer supported. The 'picked' set is now
represented as a dict instead.

A very simple test for the lod app was added, which just makes sure most
URLs do not raise an exception.