Add support for

* Remove conf:redirectRDFRequestsToEndpoint, as it is no longer clear
  which one onf multiple data sources would be the target
* Move conf:webResourcePrefix from dataset level to server level as
  we need to have the same relationship between entity URI, page URL,
  data URL etc for all datasets
* Some work towards separating the concerns of MappedResource between
  source-to-web URI mapping and the structure of related URIs on the
  web side
* Fix some minor issues with namespace declarations
Merge branch 'master' of github.com:cygri/pubby