Set svn:ignore on target dirs, add 2008/pom.xml

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/branches/BRANCH_2_0_EXPERIMENTAL/rgoers@949448 13f79535-47bb-0310-9956-ffa450edef68
tree: 7d72240e18f527b3a3598745e125e38bfe1a1fe1
  1. log4j12-api/
  2. log4j2-api/
  3. log4j2-core/
  4. pom.xml