We now depend on guava-jdk5:13.0. In both google-cloud-java and gax-java we instead depend on standard guava (version 19 and 18 respectively).

Is there any reason for depending on guava-jdk5? If not excluded (as we do in google-cloud-java), this just results in a bunch of duplicated classes in all projects that use standard guava. /cc @anthmgoogle @garrettjonesgoogle