Adds a link to the mp4 file of gfycat webm, redirects from detail page to actual file page
Fra
Add a direct link to the MP4 and WEBM files on gfycat.com and redgifs.com video pages for convenience.
Optionally can redirect after 5 seconds from "details page" to the actual file (with video player) page. But the "details page" doesn't seem to be used anymore anyway (for Gfycat).
The source URL *should* be displayed by gfycat natively now, so that part is now probably obsolete (doesn't really work currently?)
Known issue: sometimes the script fails due to the timer being too short and the page taking too long to finish loading. Need to improve on that.
