The POI HSSF transformer has been updated to use Tika. A Tika auto-detect
transformer has also been added, which caters for a large number of
previously un-handled cases. Unit tests check this.
git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@20769 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261