Update main deps

This updates the main devDependencies to the latest version of Knockout and jQuery.

In addition, it bumps the npm version.

I'm preparing a separate change request to update the other devDependencies, but updating all of them breaks the tests, so I'll take them one by one first, and squash it before pushing.

Unfortunately, the diff is a bit weird, due to npm's automatic rearranging the order of dependencies in the package.json. However, since any further updates would also do the same rearranging, I thought it best to just take the hit now.