Add instructions section.
Fix video var assignment.
Reuse the video container for previewing the video.
Merge pull request #33 from nubs/master

Reuse the video container for preview.
Fix indentation.
Id the instructions text.
Update instructions after webcam is allowed.
Merge pull request #34 from nubs/master

Add second instruction.
Only turn on the camera on the video page.
Merge pull request #35 from nubs/master

Only turn on the camera on the video page.
Process the video server side