NUTCH-1409 remove deprecated properties db.{default,max}.fetch.interval, generate.max.per.host.by.ip

git-svn-id: https://svn.apache.org/repos/asf/nutch/branches/2.x@1619934 13f79535-47bb-0310-9956-ffa450edef68
NUTCH-1693 TextMD5Signature computed on textual content

git-svn-id: https://svn.apache.org/repos/asf/nutch/branches/2.x@1619942 13f79535-47bb-0310-9956-ffa450edef68
NUTCH-1828 bin/crawl : incorrect handling of nutch errors

git-svn-id: https://svn.apache.org/repos/asf/nutch/branches/2.x@1621285 13f79535-47bb-0310-9956-ffa450edef68
NUTCH-1829 Generator : unable to distinguish real errors (Mathieu Bouchard via jnioche)

git-svn-id: https://svn.apache.org/repos/asf/nutch/branches/2.x@1622649 13f79535-47bb-0310-9956-ffa450edef68
Merge remote-tracking branch 'origin/2.x' into 2.x-dev

Conflicts:
	src/bin/crawl