Now sending email on getting a review:

whenever someone reviews a solution, solution's author might get a review
(depending on a setting).
Tweaked notification email body.
Added links to intro video.
Fixed embedded frame source.
Reacting to code review.
Added video icon to 'play' button.
Reacting to code review (#273).
Merge remote-tracking branch 'upstream/master' into 92_email_notifications
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
Merge pull request #273 from egor83/92_email_notifications

Sending email on getting a review (fixes #92)