SOLR-4308: Remove the problematic and now unnecessary log4j-over-slf4j.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene_solr_4_1@1434029 13f79535-47bb-0310-9956-ffa450edef68
SOLR-4308: Remove license files and maven references

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene_solr_4_1@1434032 13f79535-47bb-0310-9956-ffa450edef68