Summary of commit:

Additions:
* required.el:
  - Add js2-mode
  - Add web-mode
* modified.el:
  - Add auto-mode-list for s2-mode and web-mode related files
  - Add indentation for web-mode related files (html, css, js)
* enabled.el:
  - Add js2-mode
* auto-install.el:
  - Add js2-mode
  - Add web-mode

Changes:
* modified.el:
  - Replace nil values to 0 for values that are falsy for consistency
* disabled.el:
  - Replace nil values to 0 for values that are falsy for consistency
* auto-install.el:
  - Replace t values to 1 for values that are truthy