Document timepicker dependency

Hm, yes, that's a 3rd party JS library that we're using. Unfortunately the original source has been shut down. We're mirroring it here for the time being. Put it in the libraries directory.

https://github.com/palantirnet/timepicker

Updating this ticket to be a documentation issue to note that...

I've downloaded this to the libraries folder into the directory, "timepicker," but it doesn't seem to work. Any ideas about what I'm doing wrong? The rest of my Ajaxy Calendar widget seems to be working nicely.

Hmmm... not sure what I did, but it's now working. It looks like "timepicker" is the right directory for the library. I might have simply needed to clear my cache.