Transparent JSON<>CBOR defaults to false.
Only transform body to CBOR, if Content-Type is set to JSON, for now.

Conflicts:
	lib/david/server/respond.rb
Make Resource Discovery deactivatable.
1.9.3p194 does not like the version String to be frozen.
Merge branch 'master' into observe-conditional-get

Conflicts:
	lib/david/railties/config.rb
	lib/david/server/respond.rb