Updated TinCanJava API functionality and LRS response handling.

-LRS, RemoteLRS, About, LRSResponses, and Documents brought updated to new architecture.
-ContextActivities and TCAPIVersion modified to handle receiving V101 responses
-HTTPRequest and HTTPResponse modified.  HTTPRequest no longer extends ContentExchange. It instead stores the relevant
	data for a request, and the ContentExchange is constructed in a private function in RemoteLRS.