add optional server fields: "domain" and "contact"
update libertree-client
Added yaml require statement.  Not sure why this is suddenly needed, but there it is.
Bump libertree-client-rb .
Use RDBI branches which address our memory leak.
set "via" property when receiving posts
update libertree-client
Merge branch 'master' into xmpp

Conflicts:
	Gemfile.lock
	config.yaml.example
	lib/libertree/server.rb
	lib/libertree/server/responder/authentication.rb
	lib/libertree/server/responder/post.rb