Fix initial data file for groups and permissions
Move REST API resources to core app
Commit missing icons and images
Move custom i18n extraction command to core app

--HG--
rename : wger/config/management/__init__.py => wger/core/management/__init__.py
rename : wger/config/management/commands/__init__.py => wger/core/management/commands/__init__.py
rename : wger/config/management/commands/extract-categories-i18n.py => wger/core/management/commands/extract-i18n.py
Don't test with django 1.5 anymore

Django 1.6 uses a different parameter (uidb64 instead of uidb36) for the
password_reset_confirm view and it's not worth adding a check here
Output version for manager and core apps
Bump version
Unify format of urls files