Update to v1.1.7 of ZeroClipboard

Updates `ZeroClipboard.swf` and `ZeroClipboard.js` to the v1.1.7 tag of [ZeroClipboard](https://github.com/jonrohan/ZeroClipboard)

Bumps version number of `zeroclipboard-rails` to `0.0.3`

Updated `README.md`:

* To reference [ZeroClipboard](https://github.com/jonrohan/ZeroClipboard) for documentation and credits
* Include some basic examples in HTML/ERB and Haml