add .gitignore

git-svn-id: https://svn.apache.org/repos/asf/archiva/branches/archiva-1.3.x@1429695 13f79535-47bb-0310-9956-ffa450edef68
faster version of compiler plugin

git-svn-id: https://svn.apache.org/repos/asf/archiva/branches/archiva-1.3.x@1429696 13f79535-47bb-0310-9956-ffa450edef68
gitignore overlays directory

git-svn-id: https://svn.apache.org/repos/asf/archiva/branches/archiva-1.3.x@1429697 13f79535-47bb-0310-9956-ffa450edef68