Fix broken build by adding CDI to errai-ui-demo-i18n

Followup of https://issues.jboss.org/browse/ERRAI-658
Merge pull request #68 from jbarop/ERRAI-653-fix

Fix broken build by adding CDI to errai-ui-demo-i18n
Removed @Portable from navigation event to avoid server-side dep.
Fixed ERRAI-657: Weld warning for ErraiServiceBean and MessageBusBean
Moved PageReguest and MapsTo to common to avoid server side dep. on navigation