OAK-318 Excerpt support
 - removed some of the unneccesary parts, reverted to the initial behavior
 - added or support for the full-text serach token extraction from a query



git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1522815 13f79535-47bb-0310-9956-ffa450edef68