Added links to Walter Bright's talk
Added links to Don Clugston's talk
Changed to `VIDEO_URL_A`/`Y`
Added youtube video link
Added video links to Stephan Dilly's talk
Added video links to lightning talks
Added video links to Mihails Strasuns' talk
Added video links Amaury Sechet's talk
Added video links to Adam Ruppe's talk
Merge pull request #29 from JinShil/patch-1

Added video links for Day 3