Move clamp out of frame search inner loop.
Initial contributor license agreements.
Link to github.
Added MIT license.
Add info on what CLAs mean.
More CLA discussion.
Add link to CLA form.
Timeline row rendering happens all the time now, fixing out-dated rows when a thread stops sending data:
* Use requestAnimationFrame to draw all rows @ 10hz.
* Set row frame history on construction so that updating visibility doesn't need a tricky extra parameter.
* Drawing all rows will unconditionally update visibility.

Fixes #4
OK, let's ditch CLAHub. Not happy with using 3rd party apps or requiring users to give their details away.
Fix links.
Simplified CLAs and removed potentially hostile re-licensing options.
Change license to Apache 2.0, removing need for CLAs.