Removed a private inner class that was no longer being used.
Added the very loud WARNING stating that this filter cannot be used alone.
Updated the tests to account for:
 - data being cached in the Akka Client.
 - the Deproxy MessageChain's orphanedHandlings being different on Single/First and Suite executions
Merge branch 'REP-382_Take2' of github.com:rackerlabs/repose into REP-382_Take2

Conflicts:
	repose-aggregator/functional-tests/spock-functional-test/src/test/groovy/features/filters/identitybasicauth/BasicAuthStandaloneTest.groovy
	repose-aggregator/functional-tests/spock-functional-test/src/test/groovy/features/filters/identitybasicauth/BasicAuthTest.groovy