First tests with displaying results of HTTP HEAD to distinguish  RDF content types and others : RESULTS:

http://localhost:9000/display2?displayuri=http://xmlns.com/foaf/0.1/Person
http://xmlns.com/foaf/0.1/Agent    Application$

http://localhost:9000/display2?displayuri=http%3A%2F%2Fjmvanel.free.fr%2Fjmv.rdf%23me
[AskTimeoutException: Ask timed out on [Actor[akka://deductions-HttpClient/user/IO-HTTP#-2075802059]] after [10000 ms]]

TODO: FIX bad result Application$, should be "Semantic URI"
TODO: avoid Timeout by 1) storing results in a new database 2) keep 1 future per URI all the way until controller 3) ask only once for URI1#x and URI1#y

+  lazy val allNamedGraphsFuture ,  allNamedGraphs in RDFStoreObject.scala
guessSemanticURIType : use isGraphInUse to check RDF store and avoid HTTP requests

in HTTP requests use headers.Accept for RDF content types

TODO : http://xmlns.com/foaf/0.1/Person still does not work
[ERROR] [12/17/2014 14:19:51.611] [deductions-HttpClient-akka.actor.default-dispatcher-23] [TaskInvocation] exception in sameThreadExecutionContext
Caused by: java.lang.IllegalArgumentException: requirement failed
	at scala.Predef$.require(Predef.scala:207)
	at akka.dispatch.BatchingExecutor$Batch.run(BatchingExecutor.scala:55)
	at akka.dispatch.ExecutionContexts$sameThreadExecutionContext$.unbatchedExecute(Future.scala:74)