Add ES6 direct proxies to metapolator

This includes the harmony-reflect shim that patches Proxy from the
older version of the draft to the newer one (in V8)

a dummy module es6/Proxy to show our dependencies

the setup for require js in various places

a small test case to see it work

MISSING: we need to invoke nodejs with --harmony
Implement ES6 Proxy bases whitelists to read from js objects in CPS
bugfix: hasOwnProperty instead of 'in'