Refined 8d1135b9690fdfca5680aa94d20cadadd71048d0

I hadn't tested in a large enough thread. We also need to negate the
more comments/continue this thread links.
Merge pull request #688 from gavin19/master

Refined 8d1135b969
using a little CSS trickery, RES's buttons added to comments are now obscured from ctrl-f - so common phrases like 'save', 'source', etc won't come up N times (where N is number of comments) in addition to any other results...
html5 videos are now resizable via keyboard and dragging
fixed a bug with text of hide/show child comments