Fix tether.js resource url in examples

The examples are currently broken on the tether.io website, I assume this happened when you added the CNAME.

**Changes:**
- Updates resource urls to tether.js script inside examples ("[/tether/tether.js](http://tether.io/tether/tether.js)" &rarr; "[/js/tether.js](http://tether.io/js/tether.js)")
- My text editor trimmed some white-space on save