Undo snapshot dependency (Back to 3.0.3.Final) for next UF release candidate

This reverts commit 069458692cbdeea34436619063761f7df0a2ef15.
UberFire 0.5.0.CR5 release
Back to 0.5.0-SNAPSHOT
Back to Errai 3.0.4-SNAPSHOT

This reverts commit 6dee8599a704c72d9747fccb8e6cdbdb0422d0fb.