DSpace/DSpace — pull request #289 by lap82 (2013-08-23 01:00:10+00:00)
Title: [DS-1623] Upgrade DSpace-SOLR to SOLR 4

This PR really is not only the upgrade of the Solr (from 3.5.0 to 4.4.0) built in DSpace but contains also:
- upgrade lucene from 3.5.0 to 4.4.0
- upgrade elasticsearch from 0.18.6 to 0.90.3 (this is necessary to avoid dependencies from old lucene version)

See apache lucene migration for details http://lucene.apache.org/core/4_4_0/MIGRATE.html
See the solr wiki with the major changes https://cwiki.apache.org/solr/major-changes-from-solr-3-to-solr-4.html

Take care, due to the important code changes I think to share this code WITHOUT test everythings, help me please.