Update OpenID4Java; Removes dependency on missing guice:2.0

Our OpenID for Java dependency relies on some obsolete and deprecated dependencies, namely `com.google.code.guice:2.0`. This pull updates the OpenID version, and fixed a few other duplicate entries in the pom. As a result, our current build failure is fixed by this pull as well, since `com.google.code.guice:2.0` is nowhere to be found.