React wrappers, airplay auto-hiding, better thumb dimensions

• improv/thumbnails-different-dims: Update thumbnail and time range to handle different dims for thumbnails instead of hard-coded assumptions. Update mux-video example to demo and cleanup attrs. (#171) e5d52c7
• Build/react wrapper (#85) cc14b9a
• feat/availability-states: Add support for availability detection and state management. Update advanced and mobile examples for demo purposes. (#156) f3bce3e

v0.5.1...v0.5.2