Polymer/observe-js — pull request #30 by jankuca (2013-09-19 22:06:11+00:00)
Title: fix for use in strict mode

When observe-js is included in a strict mode-enabled wrapper function, `this` is undefined thus the `global` variable in the observe-js module wrapper function is `undefined`. An exception is thrown on the `global.Number` line at the top (cannot access `Number` on `undefined`).

```javascript
(function () {
'use strict';

// observe-js code here

// application code here
}());
```