disable parrallel it runs to prevent resource exhaustion on the sonatype grid
disable parrallel it runs to prevent resource exhaustion on the sonatype grid

git-svn-id: fa6390628428446db74a932a925eb2bb60b9e053@13233 52ab4f32-60fc-0310-b215-8acea882cd1b

gwt-maven-plugin/gwt-maven-plugin,gwt-maven-plugin/gwt-maven-plugin,gwt-maven-plugin/gwt-maven-plugin