Remove references to unused middleware.
Version bump
Made `__local` into a parameter. (zappa_channel)
`del` is no longer supported in Express, use `delete`.
Use infix.
Remove `magic_middleware` option, add `@wrap`.

E.g.
    @use @wrap ->
      @req.user = 'foo'
Explicitely send json error reports as JSON.
Remove databag
Add @send, @json, @jsonp, @redirect, and @format, to middleware inside @wrap.
Removed socket.io as a dependency.

This allows for simple installation if is isn't needed. See also GH#106 -- ZappaJS will use whatever version of socket.io is available. We won't bundle socket.io anymore (more about this in a coming commit).
Allow unkwown middleware modules to be `use`d dynamically:

    @use morgan: 'combined'
`app.configure` doesn't exist in Express-4
Provide bound IP address upon startup.
Add socket.io as a test dependency.
Updated README to reflect current status.

i.e. docs aren't up-to-date, etc.