ignore .idea directory

git-svn-id: https://svn.apache.org/repos/asf/incubator/npanday/trunk@1488832 13f79535-47bb-0310-9956-ffa450edef68
the SDK may not be installed

git-svn-id: https://svn.apache.org/repos/asf/incubator/npanday/trunk@1488833 13f79535-47bb-0310-9956-ffa450edef68