NUTCH-1605 MIME type detector recognizes xlsx as zip file

git-svn-id: https://svn.apache.org/repos/asf/nutch/branches/2.x@1608130 13f79535-47bb-0310-9956-ffa450edef68
NUTCH-1566 bin/nutch to allow whitespace in paths

git-svn-id: https://svn.apache.org/repos/asf/nutch/branches/2.x@1608135 13f79535-47bb-0310-9956-ffa450edef68
NUTCH-1776 Log incorrect plugin.folder file path

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