noosfero | Add rake to activate all available plugins (#573)

[Rodrigo Souto]

New comment for Merge Request 573

https://gitlab.com/noosfero/noosfero/merge_requests/573#note_1260549


Rodrigo Souto

I merged it manually because I grouped both commits into a single one: b464989
Next mr try to group your commits by logical changes (feature scoped) to simplify the tree history.

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