Restructure the way the JS is being run

[tjbenton]

This will allow for unit testing on every file in this app.

It will also update the way the data is being generated to make it a little bit easier to track down bugs and add new features by not using so many globals and separating out variables that are specific to the different functionalities of this app.

• [x] cli.js
• [x] documents.js
• [x] index.js
• [x] input.js
• [x] models.js
• [x] output.js
• [x] output/
  • [x] console.js
  • [x] couchbase.js
  • [x] default-options.js
  • [x] folder.js
  • [x] index.js
  • [x] sync-gateway.js
  • [x] zip.js
• [x] utils.js