noosfero | Use standard method for RSS-feed icon (#596)

[Bráulio Bhavamitra]

Merge Request #596 was closed by Bráulio Bhavamitra
Merge Request url: https://gitlab.com/noosfero/noosfero/merge_requests/596
Project:Branches: brauliobo/noosfero:rss-icon to noosfero/noosfero:master
Author: Bráulio Bhavamitra
Assignee: 
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