Added links to intro video.
Fixed embedded frame source.
Reacting to code review.
Added video icon to 'play' button.
Merge remote-tracking branch 'upstream/master' into 278_screencast
Reacting to code review (#278)
Merge pull request #279 from egor83/278_screencast

Added links to intro screencast (fixes #278)
Merge remote-tracking branch 'upstream/master' into 92_email_notifications