Switch to official Node.js 4.8.6 and stop using a custom Meteor build.
Switch to official Node.js 4.8.6 and stop using a custom Meteor build.

This puts Meteor back on the official release track of Node.js 4, rather
than using its own custom build (from https://github.com/meteor/node/),
which had previously been necessary to add the garbage collection fixes
gained with
https://github.com/nodejs/node/commit/751f1ac08ebf602968fc289615b9f0e553bb2572
and
https://github.com/nodejs/node/commit/71f9cdf24197b34657a050cb455901994576f054,
both of which are now officially included in Node.js 4.x as of 4.8.6.
:tada:

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