[keycloak-user] Install examples

Hey guys, I just noticed that if you want to install the preconfigured examples, the README.md file states that you should run mvn clean install. While that works fine if you have keycloak checked out and the root pom installed in your local maven repo (in the correct version), it fails if you just download the keycloak-war-dist-all-1.0-alpha-XX.zip and try to install the examples. This might be confusing for someone who just wants to quickly install the examples. I didn't check in detail yet, but I guess it could easily be avoided by removing the parent pom dependency in the example app poms. Cheers, Nils