Minor fixes to docs requested by Doug.
Split the table on the demos index page into "easy" and "technical" tables.
Added a note to the demos index page about starting two different windows.
Further note Doug wanted regarding installing client files.
Moved the self video and the controls to the top of the  other video instead of the bottom.
Added a note about limitations of webcams.
Merge branch 'master' into beta. This includes a couple smaller documentation changes made directly to the master branch.