#45 support RDF files as input for enrichment interface

[Jens Lehmann]

It would be good if RDF files (Turtle, N-Triples, RDF/XML) could be used as input for the enrichment script in addition to being able to specify a SPARQL endpoint. A most straightforward implementation could just create a temporary endpoint and load the data into it.

[Lorenz Bühmann]

Support for file was added by using JENA API.