feat(server): enable fxa oauth login + save to db

Fixes #40, almost-kinda-fixes #24.

Changes of note:
  * I'm able to do the complete oauth-driven login flow locally \o/
  * Remove jscs rule requiring a space after `function`
  * Remove 'unused' jshint rule
  * Serve static bits from `/dist`, not `/app`
  * Add mozlog logging: heka compatible in prod, yet readable for local dev

Particularly ugly/dangerous TODOs (and tracking issue numbers):
  * Added DB creation and DB client, (barely) functional yet so ugly (#24)
  * Currently making outgoing HTTP requests from inside the route handler;
    we should use a reverse proxy worker/job instead (#46)
  * Not yet using a nonce in the oauth flow (#45)
  * Not yet validating inputs w/Joi (#43)