TravisCI: Added "redis" service to config file
assets: Use raw.github.com instead of rawgithub.com

rawgithub.com seems to do some strange gzip compression that webassets is not
able to handle. this commit can be reverted once rawgithub.com is fixed.
Revert "assets: Use raw.github.com instead of rawgithub.com"

This reverts commit faa3a3115fb2978625631e997b9bc195fe607d59.

rawgithub.com is fixed now
views/errors: Handle EOFErrors by returning RequestTimeout
ol-PlayButton.js: add touchend event to play button

The click event doesn't get fired on a ipad with safari, therefore
the touchend event handler.
ol-PlayButton.css: increase z-index above 1000

Show it above the usual map overlays but below the layer switcher.