Fixed homepage play/pause on demand functionality.

If the user clicks on the video, the video pauses. Previously, scrolling
back to the top or where the video is in-frame would resume video
playback. This functionality has been changed so that if a user pauses
the video, the only thing that can restart it is the user (by clicking
on the video again).
Fixed the constant 'Cannot read property 0 or undefined' error on profile popups. Fixes #51

At the top of the profile-popup.html file, I found the image assigned
in WordPress to use -- profile is of course the one we want, but we'll
settle for other assigned images as well.