Enabled registration of service clients
Made calling a service work and did some cleanup
More code cleanup
Added MD5 verification for request and response messags upon ServiceClient registration.
Fixed comment
Merge branch 'jjekircp-server_service_client' into indigo-devel
Make ServiceClient::handle public, to fix compilation bug.
Merge branch 'indigo-devel' into fix-headers

Conflicts:
	rosserial_server/include/rosserial_server/session.h
	rosserial_server/include/rosserial_server/topic_handlers.h