Add initial video test page. Make video fallback player params more flexible to support it.
Honor youtube base URL override
Prepopulate form
Handle video fallback player with no notes tab to open
Use cleaner way of temporary base url overriding and fallback disabling
Pass along fake blocking string to form
Remove old parameter reference
Remove unused statement
Formatting of detectflash method
Change wording
Make text larger
Merge pull request #637 from code-dot-org/video_test_page

Video test page