noosfero | Add Metadata plugin (#359)

[Bráulio Bhavamitra]

New comment for Merge Request 359

https://gitlab.com/noosfero/noosfero/merge_requests/359#note_821589


Bráulio Bhavamitra

@leandronunes  Yeah, MetadataPlugin::Spec conflicts with RSpec's definition. I'm fixing them.

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