Merge branch 'noosfero-integration' into 'master'

Noosfero integration

This integrates Colab/Noosfero apps in means of CSS/JS.
Tasks accomplished whithin this merge:
1. Added noosfero proxy as a Django app
2. Remake of Colab navbar and footer
Removed old logout view
Added login view (missing template)
Fixed pep8 errors
Login template
Updated i18n source file
Updated pt_BR translations
Added transifex config
Added fork me ribbon
Added mo files
Set COLAB_SETTINGS default only in one place
Reading settings from /etc/colab/settings.d
Added md5 hashes to static file names
Updated converse.js
Updated converse.js
Using static from staticfiles framework
Generic ribbon
Improved rule to remove all theme css