This change also cleans up some redundant POM metaadata.
Even though Maven documentation does not list it, also the organization
section is inherited to the effective POM.
pom-template.xml is still in the project for a longer description and a
repositories section until publishing to staging is cleaned up.
Change-Id: I76b71aec1d2812e2f9ef321c3b4131c613a29cb7
GWT compiler is launched as a separate java process,
and it's better to implicitly start headless execution
Change-Id: Ied4e8da5e0c2edc436e4b25602bf8e5aefd15f23