pt_BR Translations

Added pt_br translations.
Get rid of non-ASCII in README.rst
Django 1.6.x: ImproperlyConfigured: You're using the staticfiles app
without having set the STATIC_ROOT setting to a filesystem path.
Added Amazon OAuth2 support.
Added Paypal OAuth2 support.
Improved style.
Fixes some Spanish language inconsistencies.
Added Amazon and Paypal documentation.
Token secret too limited for Amazon
TypeError when going directly to /accounts/social/signup/ (closes #488)
`VERIFIED_EMAIL` should not take `verified` into account (closes #487)
Avoid generating usernames containing whitespaces
PEP8 cleanup
Default rendering of template threw a traceback. Added missing
template tag for url rendering.
Improve searching in SocialAccountAdmin.

Add email, first name, last name and username to search_fields.
Be lenient and allow spaces in login field
Updated pt_BR translatations
Amazon HTTPS (closes #507)
Merge branch 'master-upstream'

Conflicts:
	allauth/locale/pt_BR/LC_MESSAGES/django.po