Add support for SLF4J API

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/branches/BRANCH_2_0_EXPERIMENTAL/rgoers@1067833 13f79535-47bb-0310-9956-ffa450edef68
23 files changed
tree: c8774ce9ec6a482d4c7b64cf0eb4c8bdc9a92575
  1. log4j12-api/
  2. log4j2-api/
  3. log4j2-core/
  4. slf4j-impl/
  5. pom.xml