adds JavaScript URL shortener library loading

Adds loading the jQuery-URL-shortener library.  For more information,
see https://github.com/hayageek/jQuery-URL-shortener
adds javascript: prefix

Mainly to facilitate build testing in the browser.
Merge branch 'master' of git@github.com:Dispader/gmail-link.git

Conflicts:
	src/javascript/gmail-link-bookmarklet.js