AerisTile: remove trailing '/' from server attr
minor: custom error message formatting
Leaflet tile destroys view reference

- hoping to improve memory usage
Animation#setSpeed: Validate speed
Refactor AutoUpdateAnimation to work with future times

- Updates from/to by masterLayer's 'autoUpdateInterval' attribute,
  instead of reset `to` to current time
TileAnimation: bind to/from to AnimationLayerLoader
TimeLayersFactory: Recreate layers every time

- In order for future times to become past times,
  we need to recreate layers