Add support for http-only pvweb servers.
This issue was created automatically from an original Mantis Issue. Further discussion may take place here.
Currently, paraviewweb and vtkweb servers can be based only on WAMP (websocket and longpolling are currently supported, at least on the server side). However, adding support for http-only servers will expand the capabilities so that more projects can make use of paraview and vtk web.