Add debounce interval to config
Add timezone awareness

Rather than use the local system time, we're going to presume that
everything is stored using UTC. Then, we convert back and forth, using the
offset values reported by the user's browser.

This should work for the graph, too, which is kinda cool.
This should probably work on PHP 5.3
Mostly tweaks, finalizing

But encoding became a big deal here. Turns out you have to use the utf8mb4
character set, or 4-byte UTF characters can't be used. And MySQL really wants
to use latin1.
Readme and tweaked about page
Update README.md
Update README.md
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