Add ability to serve static content using 'send'

Also, replace bouncy with http-proxy since otherwise 'send'
and 'bouncy' get confused with each other. I think it's because
bouncy sees a HTTP1.1 KeepAlive and proxies the entire session
so send isn't able to do the right thing.

However, http-proxy just proxies each request and doesn't keep
sending the same connection through, therefore send can do the
right thing when asked to. :)