noosfero | Fixes problems when editing a product (!1119)

[Gabriel Silva]

New Merge Request !1119

https://gitlab.com/noosfero/noosfero/merge_requests/1119

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

Closes #236 

Fixes an issue where it was not possible to update the price, discount and description of a product.

Also fixes html_safe issues (some of which are listed in #235)

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