Remote plugin example

1. Comments

• This presentation embeds reveal.js and the chalkboard plugin (with custom controls and font awesome buttons) from remote locations.
• See these related issues:
  • issue #60 (non-relative paths with REVEAL_ADD_PLUGIN)
  • issue #100 (slides blurry)
  • issue #116 (all files from CDN)
  • issue #120 (icons with custom controls)
• Press b or c as usual to work with the chalkboard.