Move to https://youtube.com videos. Enable and test video fallback player.
Add coverage of YouTube params + pages for non-mobile browsers
Use more standard indexOf-as-contains idiom
Add more notes on fallback player
Notes formatting
Merge pull request #609 from code-dot-org/test_and_enable_video_fallback_player

Test and enable video fallback player
[Finishes #70970596] Simple callout for Jigsaw level 1
Merge pull request #617 from code-dot-org/jigsawCallout

[Finishes #70970596] Simple callout for Jigsaw level 1
Automatically built.
Merge pull request #618 from code-dot-org/finished

deploy to delivered