Info tab

The primary feature of this PR is adding the "Info" tab to the Galapagos UI.  This affects Tortoise, Teletortoise, and the standalone model pages.

This PR also introduces a tabbed UI to Tortoise (on the non-standalone pages).  I understand that at least one person will view this as controversial, but I've chosen, at the moment, to bundle stuff up into tabs in order to conserve screen real estate.  We can always improve the UI later—and we should!

Also, I deleted the example Tortoise pages, because they're pretty out of date (missing widgets and "Info" tab), and I find maintaining them to be more hassle than what we're gaining from them—what is it that we're gaining from having them, again?  I could be convinced to bring the pages back, but I'm displeased about the amount of effort that I've been having to put into keeping them running.  I semi-regularly find them broken without anyone seeming to have noticed, so I'm not convinced that they're terribly important to other people, anyway.

Review/merge by @qiemem, please.
The purpose of the tortoise initializer stuff is that it can be attached to an element with requiring anything of the element itself. This makes it so that it can only be used by pages with very specifically prepared html. I would much prefer if all elements (except for the container element) required by tortoise were created by tortoise. This is the same strategy employed by many libraries that add sophisticated elements to web pages (such as both CodeMirror and Ace, a variety of jquery ui plugins, and so forth).