Cascade Deleting

[LinnierGames]

Operations to Cascade

• [x] Delete a hotel (deletes the reference in the trip.hotels array)
• [x] Delete a site (deletes the reference in the trip.sites array)
• [x] Delete a trip (deletes sites and hotels)
• [ ] Delete a user (deletes trips)

[phylliswong]

Right now there is no way to delete a user. Also, we may want to keep user data.