Set ignore properties for git/subversion for .launches and .externalToolBuilders eclipse dirs

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.20-security@1102451 13f79535-47bb-0310-9956-ffa450edef68

.gitignore

@@ -15,6 +15,8 @@
 
 *~
 .classpath
+.externalToolBuilders
+.launches/
 .project
 .settings
 .svn