Added tests for chunk management

(cherry picked from commit 9750e315fd0aae231108039550c1f3cb934c9dbb)

Conflicts:
	spray-funnel/src/test/scala/com/pragmasoft/reactive/throttling/issues/server/Issue7_ChunkedRequestNotSupported.scala
Trying to reproduce timeout problem from issue #7 with many parallel resource requests (not reproduced)