added models to hold temporary data before migration
added migrations for User submitted jobs
added migrations for other opportunities
added migration for wegot ad jobs
raise exception when migrations reach 0021 - require switch to different version
copy change
Merge pull request #11 from praekelt/migrate-data-without-deleting-models

Migrate data without deleting models
allow migrations to continue in 4.2
delete old models
added skills and status update models
Merge pull request #12 from praekelt/migrate_temp_tables_to_new_models

Migrate temp tables to new models
bring back migration stop
fix migrations and re-release
added stop migrations in master
Merge branch 'master' of github.com:praekelt/ummeli into develop