Added seeds / the root set.

Seeds / The root set are where the webcrawler should start downloading web pages from.
Simple url stop rules, and advanced rules which required data from a HTML5 parser combined
with limits defines whether or not the webcrawler will download and parse the content
 pointed to by a link.

new file:   seeds.go
Merge branch 'master' of https://github.com/larsth/copsubbot

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