Use jquery.min.js downloaded from jQuery.com

Mozilla Addons Editors check sums (sha256sum fwiw) against
a list of frequently used libraries http://mzl.la/amo-libs

Ours did not match because we uglified it all by ourselves.
Bump Firefox Addon to 0.2.2

Because of the jquery.min.js change
Actually add jquery.min.js
Merge pull request #1690 from hypothesis/use-upstream-minified-jquery

Use jquery.min.js downloaded from jQuery.com