Changed std::mutex to std::recursive_mutex in the client/server wrappers. This will...

Changed std::mutex to std::recursive_mutex in the client/server wrappers.  This will allow us to call create/get/put/etc from the entity handler\!

Added the simpleclient/simpleserver changes from Sashi's review.  Should be able to use them to test post.

Change-Id: I3e96e0a1915e4da0e4ce5880db0b00c6dd73f247