Remove jquery dependency

[mejackreed]

In the spirit of #45 from @thisisaaronland .

@2SC1815J what do you think about using native fetch and Promise ?

[thisisaaronland]

FWIW, I just tried this with Leaflet 1.5.1 and this example and everything seems to work fine:

https://go-iiif.github.io/go-iiif/

[abrin]

@mejackreed this looks nice and clear. my only question is whether you want to be adding a catch to your promises and logging the errors? If you version this, we can test this in our simple implementation.

[mejackreed]

That's great feedback @abrin. I'll look into adding that , or feel free to submit a PR to this branch if you have an idea of what you would like to see.