render: Change how we store render passes info. Previously we used a dictionary with integers as keys, which doesn't go well with JSON serialization. Now replace with an array of fixed length with items that are `None` by default.

path_mode: absolute
files:
  - ../bower_components/jquery/dist/jquery.js
  - ../bower_components/bootstrap/js/transition.js
  - ../bower_components/bootstrap/js/collapse.js
  - ../bower_components/bootstrap/js/scrollspy.js