As a previous Leap Motion user I’ll field this one:
I believe the .js file was called leapHands.js and improvements on this file have not been taken up by @ctrlaltdavid personally, I wouldn’t expect it to return as hand controllers by Vive and Rift will be the new “norm”
I really enjoyed support for the Leap while using the DK2; but it makes perfect logical sense to drop support when considering things like tracking space; and near-future hand controllers.
Hope that helps. Don’t shoot the messenger.