Document Npm and Cordova in package.js
Improve documentation, add to table of contents
Make data.js smaller
Make data.js about half the size
Remove extra bit in the docs
Merge branch 'devel' into npm-cordova-docs
Talk about tarball URLs
Documenting Npm and Cordova in package.js

Summary: Also includes improvements to JSDoc, ignore those!

Test Plan: Read the docs

Reviewers: slava, ekate

Reviewed By: slava

CC: nim

Differential Revision: https://phabricator.meteor.com/D819