GORA-339 Upgrade Solr Dependencies to 4.8.1

Hi Folks, this patch
 * Upgrade solr-core and solr-solrj libs to 4.8.1
 * Upgrades Tika to 1.5
 * Make some formatting changes within various pom.xml's
 * Adds necessary (and some unnecessary) Solr configuration files
 * uses org.apache.commons version of commons-io
 * changes cleanup of data directories generated during Solr tests
 * UPGRADE'S GORA TO USE JAVA 7 as required by Solr 4.8.1
Please review and comment. You can also see the patch for master branch attached to the GORA-339 issue.
Thank you very much.