Add svn:ignore for IntelliJ

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/commons-skin/trunk@1563116 13f79535-47bb-0310-9956-ffa450edef68
tree: 406aeacb36619dc19625b3c27603f438be34ede6
  1. src/
  2. pom.xml