[WIP] Get rid of jQuery

[tripu]

This fixes #2. As discussed, this should noticeably speed up pages using Apiary:

webapi, Sep 04 14:08:05 <tripu> when fetching those pages for the first time (no cache), most of the time (~2s) is spent downloading jQuery

(While at it, I also simplified the function get, removing the param callback, since it was always equal to crawl.)

Because now we don't have the cushion of jQuery 1.x, testing compatibility is more important.

This tested OK already on:

• Chromium 47 (Ubuntu).
• FF 43 (Ubuntu).
• FF Beta 42 (CyanogenMod).
• Android native browser 5.1.1.

Before merging, I'd like help to test at least on:

• Old IE (versions ≤ 8).
• Edge.
• Safari.

[tripu]

I'll rebase.

[deniak]

LGTM! Feel free to merge.