Merge branch 'feature-user-registration' into 'master'

AKModel/templates/AKModel/user.html

AKModel/templatetags/tags_AKModel.py

AKModel/urls.py

AKModel/views.py

AKPlanning/settings.py

AKPlanning/urls.py

AKSubmission/templates/AKSubmission/ak_detail.html

AKSubmission/templates/AKSubmission/ak_history.html

AKSubmission/templates/AKSubmission/submission_overview.html

AKSubmission/templates/AKSubmission/submit_new.html

AKSubmission/templatetags/tags_AKSubmission.py

requirements.txt

templates/base.html

templates/messages.html