NUTCH-1640 Reuse ParseUtil instance

git-svn-id: https://svn.apache.org/repos/asf/nutch/trunk@1529802 13f79535-47bb-0310-9956-ffa450edef68
NUTCH-1562

git-svn-id: https://svn.apache.org/repos/asf/nutch/trunk@1529813 13f79535-47bb-0310-9956-ffa450edef68