Plugins for reveal.js 4.0.2 - alpha

This alpha release provides the plugins based on reveal.js 4.0.2. These plugins will not work with older versions of reveal.js.

Changelog

• Keybinding are hardcoded in the plugins
• Removed mathsvg plugin
• Removed spreadsheet plugin
• Moved broadcast plugin to https://github.com/rajgoel/reveal.js-broadcast