fixed main and won-matcher-solr poms
added the ldspider scripts dir
added siren folder
fixed exact rdf matching
really fixed exact rdf matching
fixed linked data for needs

* changed the date pattern
* changed need RDF so as to expire never
improved text on createNeed jsp
implemented SPIN-based restrictions
first working version of SPIN-based restrictions
added search service
Created won-matcher-webapp. Working on ld+json serialization.
Merged feat-matcher-pull with feat-restrictions
Converting Jena Model -> Json-Ld RdfDataSet. The (very generatedly looking) rdf gets printed to the console atm.
added NeedBuilder and implementations
added search service
Merge branch 'feat-restrictions' of github.com:researchstudio-sat/webofneeds into feat-restrictions
added search service
minor cleanup

* removed resolved/wrong TODOs
* removed dead code
fixed configuration bug in postgresql config

postgres db name for owner and node were identical causing integrity violations
unified RDF reading and handling of the null relative URI