Included minified version from plugin repository if supllied there.
If not, used http://marijnhaverbeke.nl/uglifyjs on the unminified
source file (keeping "head" comments, which usually include license
info).
Saved ~42% of plugins.js. \o/
References #189
Technically being third-party libraries, these should be included
in our combined plugins js file. Once that file is being generated,
we can remove these to from serendipity_editor.js.tpl.
References #189