[#95] Targeted Notifications

.gitignore

src/models/authorization-bag.ts

src/models/cern-authorization-service.ts

src/models/channel.ts

src/models/group.ts

src/models/notification.ts

src/models/preference.ts

src/models/user.ts

src/services/auth-service.ts

src/services/groups-service.ts

src/services/impl/auth-service-impl.ts

...impl/auth/create-update-user/create-user-with-defaults.ts

src/services/impl/auth/create-update-user/create-user.ts

src/services/impl/auth/login/Login.ts

src/services/impl/channels/add-group-to-channel.ts

src/services/impl/channels/add-member-to-channel.ts

src/services/impl/channels/find-all-channels.ts

src/services/impl/channels/find-channel-by-id.ts

src/services/impl/channels/set-channel-owner.ts

src/services/impl/command.ts