New features:
- Chrome canary support on Mac.

Bug fixes:
- Firenvim does not hang anymore on pages that contain numerical HTML
  IDs.
- Firenvim now defaults to markdown on all reddit subdomains
- Firenvim will now always properly disappear from the page on page
  changes in web apps.
- The neovim plugin now uses a "firenvim" namespace for its tools,
  preventing conflicts with other plugins.
- firenvim#press_keys now correctly registers modifiers for special keys
  (e.g. <C-CR>).