Updates of namespaces and composer.json

* updated used namespaces
* moved example from test to example folder
* introduced composer.example.json
Look on whole `require` statement.

I recommend putting as close to reality versions here as possible:

* "qa-tools/qa-tools": "~1.0@dev",
* "qa-tools/behat-extension": "~1.0@dev",
* "mindplay/annotations": "~1.2@dev",
* "behat/mink": "~1.5@dev",
* "behat/mink-selenium2-driver": "~1.1@dev"