Use async and await over bluebird convenient functions

[btkostner]

Bluebird has a lot of great functions, like map and filter, but we can get the same functionality using await and native functions. We should start migrating (considering?) to use this form instead of bluebird. This will will help us in reducing the need for global.Promise = require('bluebird'), help us be fully native (without babel) when async and await finally land in node, and help us finally remove that pesky entry.js file.

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