Add basic template for nutch-site.xml.
Tune nutch settings for performance.
Add nutch-site.xml template for metadata plugin.
Merge branch '2.x-metadata-plugin' into 2.x-dev
Merge remote-tracking branch 'origin/2.x-nutch-site-xml' into 2.x-dev
Add a combined nutch-site.xml template (basic settings, performance tuning, hbase, solr, elasticsearch, metadata plugin).
Update regex-urlfilter template to be less restrictive.