New pt-BR translations

Updating new pt-BR translations files
New compile translations
Added Breno Uchoa to AUTHORS
Merge
fix django-compressor readme link
Added Nar Kumar to AUTHORS
Merge
Hide printing STATIC_ROOT in deploys.
Added paragraph to mezzanine/docs/user-accounts.rst about ACCOUNTS_NO_USERNAME
setting.
Used username_label variable in the PasswordResetForm label
(accounts/forms.py).
Improved dutch translation files
Merge
Added Tim Slot to AUTHORS.
Pin html5lib, see https://github.com/jsocol/bleach/issues/94
Added an extra safeguard for type errors in editable settings.
Added new sites to README.
Version bump to 1.4.7
Added tag 1.4.7 for changeset 473f680211b6
Update auto-generated CHANGELOG, settings docs, requirements.
Fix nginx config to work on more recent ubuntu versions.

Not sure how backwards compatible this is.
Please see: http://stackoverflow.com/questions/8768946/dealing-with-nginx-400-the-plain-http-request-was-sent-to-https-port-error