Allow 'component' modules

[willscott]

The page at
https://api.github.com/repos/manuelstofer/websocket-multiplexer/contents/component.json

Has access-control-allow-origin:*, so for repos which have that file defining their files, we can load metadata from
http://50.116.26.197/components/search/
or from github directly do pull in that code.

Harmony Proxies may be needed to make require() work, unless a component tree is to live entirely within a freedom module. That spec is at http://wiki.ecmascript.org/doku.php?id=harmony:direct_proxies