Couscous website

- Added [couscous](https://github.com/CouscousPHP/Couscous) dependency
- Bump dev requirement for PHP to 5.4 due to couscous
- Add initial config
- Rename CHANGES to CHANGES.md to include it in generation.

The end result looks something like this.
![wsdl2phpgenerator 2014-12-09 09-31-34](https://cloud.githubusercontent.com/assets/73966/5354287/3169c02c-7f86-11e4-9bc7-4ee29014054c.png)

If we get this in then we can run `couscous deploy` as a part of our release process as suggested in #95.