Documentations and examples are outdated about how to use closure-template in JavaScript

Hi @mikesamuel , @lukesandberg and others ,

My team and I will be very happy if we could use the `soyutils_usegoog.js` file in JavaScript because we are facing some troubles as you can see here #127

**After some investigation in the history of this GitHub repo, I think the reason why `soyutils.js` is missing is because of these two commits :**

1. [Deprecate soyutils.js and recommend the _usegoog version.](https://github.com/google/closure-templates/commit/c67c9de9d61861858f5e2bfd38bb0b4c3dc9bc6f)

2. [Remove the non-Closure version of Soyutils.](https://github.com/google/closure-templates/commit/e74fcfa284a1e31d42ac93e53cb84a71f638c70b)

If I understand good to use closure template in JavaScript we must use `soyutils_usegoog.js`.

**BUT it's impossible to know which files of closure-library must to provide to use closure-template in Javascript.**

Please could you explain and update the documentation on how to use the `soyutils_usegoog.js` version and **what can we have to download on closuse-library repo and which files must be provide to have `soyutils_usegoog.js` to work perfectly ?**

More over, could you update all javascript example in this repo because all of these files use the wrong one and no one can understand the best way to use `soyutils_usegoog.js`

Many thanks.

Start with the JavaScript examples and the documented use of soyutils_usegoog.js; compare them with the two linked history commits and issue #127. Identify which Closure Library files are required, document that setup, and update the JavaScript examples to use the documented approach.

Written by the indexing model from the issue text.