Changes:

• Slides can now have different in/out transitions (more info, #1106 by @jammon)
• Custom formatting support for slide numbers (more info, #965)
• Lazy loaded iframe elements now only load when the containing slide becomes visible and unload again once hidden
• GIFs now restart when they become visible
• Support for slide backgrounds in the overview mode
• Config options for controlling parallax background movement per slide (#733 by #lukekarrys)
• Simplified build script now compiles all CSS in themes folder
• Only preload last slide when we're configured to loop
• Add data-background-loop option (#1138 by @denehyg)
• Core CSS no longer overrides text selection color
• Removed roll-in fragment style as it was consistently crashing Chrome (#1150)

Bug fixes:

• Fix Markdown table column alignment (#1050 by @fehmer)
• Fix view distance calculation for looped presentations
• Fix inverse progress bar navigation in RTL mode
• Fix error where Markdown slide separators did not work on some systems (#929 thanks @callahad)
• Resolve conflict which caused auto-sliding not to work on a slide with a data-autoplay configured media element (#1170)
• Input focus inside of iframe elements no longer breaks slide layout
• And more...