sindice support added

this closes issue #2
upgrade to Play 2.1.1
using xercesImpl 2.11.0 now. using commons-io 2.4 now.
ajax request should only accept POST
ontology validation moved to ValidationUtils.

See problem
http://stackoverflow.com/questions/15926195/jena-reading-a-model-takes-f
orever
added rdf to accept header
removing duplicate domain check
bugfix: first page of api results wasn't processed.
increased concurrrent download count