protobuf/java will become a parent pom that will contain two modules: core - contains all of the code for the protobuf-java artifact util - contains all of the code for the protobuf-java-util artifact Also cleaned up various Maven warnings.
Change-Id: Ibb3fe6f919cc7ca0df91da5e1697ba33d259e433
Protoc, C++ runtime and Java runtime are updated to v3.0.0-beta-1, other languages are updated to v3.0.0-alpha-4.