2.4.0

Major changes:

• Embedded media (<video>, <audio> and YouTube <iframe>) are now automatically played
• Greatly improved RTL support
• Added Reveal.sync() method, update internals to match current DOM and config

Other changes:

• Fixed changing of keyboard, touch, controls and progress flags through using Reveal.configure
• Auto-slide now resume after overview/pause
• Added error messaging when external markdown fails to load
• Added Reveal.avilableRoutes() API method
• It is now possible to override the transition for a specific slide (more info)
• Fixes conflict between notes and remotes plugins
• Added support for transitionSpeed config value (default/fast/slow)
• Added support for data-transition-speed attribute on sections (more info)
• getIndices now returns an f property for the current fragment index
• Added more state backgrounds
• Broader code highlighter language support (full list in source)
• Set data-trim on your <code> blocks for automatic whitespace trimming
  paused when their container slide is hidden. Can also be configured to auto-play when slide is entered (more info)
• Fixed bug where progress bar would not scale when the window was resized
• Fragments now reflect visually in the main presentation controls
• Added fragment config option for disabling all use of fragments
• Showdown has been replaced with marked for GitHub flavored Markdown parsing
• HTML characters in code-blocks are automatically ecaped unless the <code> wrapper has data-noescape
• Fixes flickering linear transition in iOS
• Added setup instructions and Grunt serve task (more info)