Moved the maven_script.sh from bikeshed/scripts to tools/scripts

Patch by: amitmanjhi
Review by: fabbott (TBR)

Review at http://gwt-code-reviews.appspot.com/666801


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@8318 8db76d5a-ed1c-0410-87a9-c151d255dfc7