Doesn't work with Zepto

[luaVolk]

it seems theres a bunch of jquery only methods that arent available in zepto being called.
Had to remove about 7 of them to get it to work
I guess there should be some type of check to see if the methods are available.

[elia]

We probably should just remove the advertised support for it.
It looks kinda abandoned and we're a bit struggling to restore our CI, but if you're interested in restoring the support I'd be happy to review and merge PRs or fork into opal-zepto.