Publish pre-built binaries and npm package

[daniel-j-h]

Users should be able to install the Node.js bindings (and all tools in this project) via npm install transit. The common way we do this at Mapbox is as follows:

• [x] Bundle dependencies via Mason and install them before building the project
• [x] Let Travis build and publish binary dependencies for your transit.node Node.js bindings
  • [x] Follow the docs for node-pre-gyp on how to build and publish binaries to our mapbox-node-binary s3 bucket
  • [x] Follow this PR for creating an aws user with permissions; you need to tokens to let Travis copy artifacts to the s3 bucket (use osrm's ci.template.js as starting point, the one in the PR has some issues ...) - you can publish locally first to see if it works; mbx auth, then follow the steps in the node-pre-gyp docs.
• [ ] Manually publish the Js part of the package to npm, npm publish transit -- Moved to https://github.com/mapbox/nepomuk/issues/108
• [x] Write releasing docs

Here's the Pull Request for node-or-tools https://github.com/mapbox/node-or-tools/pull/13

[MoKob]

I've moved the npm publish to the alpha-deploy. By now we got binaries on S3. Closing here.