noosfero | Products Plugin: fixes price composition edit form (!1094)

[Gabriel Silva]

New Merge Request !1094

https://gitlab.com/noosfero/noosfero/merge_requests/1094

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

The edit form was not being rendered due an internal server error. This patch also fixes the following bugs:

* Escaped HTML in production cost select box and price composition bar description
* Javascript that controls the price composition wasn't updating the value, and did not consider empty prices
* Products Block style

Closes #237

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