add django-allauth package

Rename `base.html` used for cms pages to not conflict with general templates.
create SysterUser on auth user signup + unittests
add view decorators for checking membership, authorship and admin rights
change sphinx theme
configuration of social accounts documentation
set NOSE_ARGS in testing settings and update README on running tests
Merge pull request #7 from ana-balica/allauth

Add and configure django-allauth package
Merge pull request #16 from ana-balica/dashboard_decorators

Add view decorators for checking membership, authorship and admin rights
Merge pull request #18 from ana-balica/test_settings

Update testing settings
Merge pull request #22 from ana-balica/social-login-documentation

Social login documentation
Implements add news functionality for community , view function + tests + url +templates

Flake 8 errors