removed newsletter function
readied migrations for creatingTables and added new migrations for drop_table
Merge pull request #458 from hpi-swt2/feature/remove-newsletters

removed newsletter function
Merge branch 'develop'
removed newsletter associations
basic import for new alumni approach
a little bit of cleanup
email and first link logic
working alumni import flow
registration of alumni addresses available to everyone
Merge branch 'develop' into feature/alumni-import
Merge pull request #473 from hpi-swt2/feature/alumni-import

Feature/alumni import