noosfero | Fix join community as a visitor (!1062)

[Pedro de Lyra]

New Merge Request !1062

https://gitlab.com/noosfero/noosfero/merge_requests/1062

Project:Branches: pedrodelyra/noosfero:issue_230_fix_join_community_as_a_visitor to noosfero/noosfero:master
Author:    Pedro de Lyra
Assignee:  

It looks like Rails demands a csrf token field for ajax requests too, so I added one to fix this bug.

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