noosfero | Fixes HTML safe problems (!1090)

[Gabriel Silva]

New Merge Request !1090

https://gitlab.com/noosfero/noosfero/merge_requests/1090

Project:Branches: gabrielssilva/noosfero:html_safe to noosfero/noosfero:master
Author:    Gabriel Silva
Assignee:  

Fixes the following HTML safe problems

- Abuse complaints content
- Registration intro text
- Versioned article body

Closes #233 
Covers partially #235

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