NUTCH-1798 Crawl script not calling index command correctly (Aaron Bedward via jnioche)

git-svn-id: https://svn.apache.org/repos/asf/nutch/branches/2.x@1605975 13f79535-47bb-0310-9956-ffa450edef68
NUTCH-385 Improve description of thread related configuration for Fetcher

git-svn-id: https://svn.apache.org/repos/asf/nutch/branches/2.x@1605979 13f79535-47bb-0310-9956-ffa450edef68