noosfero | Drop hpricot (unmantained) and replace with nokogiri (#366)

[Bráulio Bhavamitra]

New comment for Merge Request 366

https://gitlab.com/noosfero/noosfero/merge_requests/366#note_879441


Bráulio Bhavamitra

updated to run all tests via CI. @terceiro is it ok to drop hpricot?

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