NUTCH-656 Generic Deduplicator (jnioche, snagel)

git-svn-id: https://svn.apache.org/repos/asf/nutch/trunk@1541883 13f79535-47bb-0310-9956-ffa450edef68
Removed all in one Crawl class (NUTCH-1621)

git-svn-id: https://svn.apache.org/repos/asf/nutch/trunk@1541885 13f79535-47bb-0310-9956-ffa450edef68
Giving Cleaning and Deduplication jobs a name to display

git-svn-id: https://svn.apache.org/repos/asf/nutch/trunk@1541917 13f79535-47bb-0310-9956-ffa450edef68