Remove CLI related files. Fixes #117

This goes together with https://github.com/wsdl2phpgenerator/wsdl2phpgenerator-cli/pull/1
These developer dependencies are no longer needed. They deal with packaging and releasing the app as a Phar file. This will be handled by the CLI app.

```
"kasperg/phing-github": "0.2.*",
"kherge/box": "2.4.*",
"phing/phing": "2.7.*"
```