Renaming aerogear

I think only the package inside the file has been changed, the `wfk` package/file structure is there there: 
https://github.com/abstractj/aerogear-push-quickstarts/blob/renaming_aerogear/server/contacts-mobile-proxy/src/main/java/org/jboss/quickstarts/wfk/proxy/JsonProxyServlet.java