NUTCH-1721 Upgrade to Crawler commons 0.3

git-svn-id: https://svn.apache.org/repos/asf/nutch/trunk@1566255 13f79535-47bb-0310-9956-ffa450edef68
NUTCH-1707 DummyIndexingWriter

git-svn-id: https://svn.apache.org/repos/asf/nutch/trunk@1566586 13f79535-47bb-0310-9956-ffa450edef68