mqtt receiver

Ignore-this: bd75534b031cb79a489bcaf27d196062

darcs-hash:20131231075358-312f9-69a24853955252203cea3c1fb3ff2252f29b3633
bring back semi-working pinch zoom

Ignore-this: b0af7d64a63364426a3614c54c4cc79e

darcs-hash:20131231092756-312f9-ec290c8f19a5893f97c51f7b292c5c373995a4d7