ARQGRA-197: page objects location encapsulation - first try

* I quite stuck with how to get `` @ArquillianResource contextRoot`` being injected to ``GrapheneEnricher``
https://github.com/jhuska/arquillian-graphene/blob/ARQGRA-197/graphene-webdriver/graphene-webdriver-impl/src/main/java/org/jboss/arquillian/graphene/enricher/GrapheneEnricher.java

* I thought of something like: ``public void testFoo(@Location MyPageObject obj, @ArquillianResource URL contextRoot, @MyBrowserQualifier Webdriver webdriver)`` to denote the ``contextRoot`` and the browser which will be used.

Thanks!