The cookies property seems to belong more properly to HTTPRequest, since it's derived from the request headers. This also exposes it as a useful API to programs which don't subclass Application, relying solely on the httpserver module.
Tests are also updated.
Move 'cookies' property from RequestHandler to HTTPRequest
this pull request should probably still expose a proxy parameter on RequestHandler so that it's backwards compatible with anything that is using that currently
jehiah++. Merged with the RequestHandler.cookies property added back.