Build and Distribute Binaries for npm

[daniel-j-h]

Similar to the ticket about Python Wheels we should build and distribute pre-built binaries.

This would allow users to do

npm install sweep

and get everything pre-built, packaged and set up for their platform. For now users have to compile, link, and install libsweep.so themselves before being able to install and use the Node bindings.

The common way to do this is to hook into the Node binding build system via node-re-gyp and store binaries on S3 or Github releases. Here's documentation and a skeleton repository:

• https://github.com/mapbox/node-pre-gyp
• https://github.com/mapbox/node-cpp-skel

Note: this is on the wish-list but certainly not prioritized right now. Feel free to jump in and help out here.