Cleanup in res.view() for better erros.
Added res.guessView() and res.jsonx() methods.  Purposely did not carve out an exception for them in the response hook so that they may be overridden.
Adds res.jsonx() method in responses hook so that it works for both virtual requests that come in via the interpreter and requests that are originated by hooks (e.g. http hook->express)
Use Express's friendly handling of res.send(statusCode) when res.jsonx is called without any data
Merge branch 'master' of github.com:balderdashy/sails
virtual requests from a socket always 'wantsJSON' (at least for now)