Option to not minify when saving

As talked in #55, I've added an option to toggle the uglifying to the menu, and I've also fixed the tooltipMessage which was a bit messed up. I couldn't come with a better way to show the toggling, since the dropkick menu does weird stuff with its html.

I hope this works.

ps: I haven't been able to actually save the gist, so I couldn't check that (something with bad code request, probably didn't set up properly), but I've stepped through the code when doing saveGist and it does the correct thing before calling to save the gist, so it should work fine.