Browser *and* Node.js module import

I have reinstalled `uri-templates` under an alias:

```
jspm install uri-templates=npm:uri-templates
```

And added the corresponding Node module:

```
npm i uri-templates --save
```

And updated the import path from `npm:uri-templates` to `uri-templates`.

This allows the import to work in browsers and Node.js. :-)

Please see breakdown in commits.