Added transaction controller and create method.
Created how_long_ago, ammount_in_units and get_actor methods.
Merge branch 'develop' of https://github.com/Lambin/fast-meadow-6661 into feature-backend-transaction
Created methods for finding item name and location name for transaction.
Created create_transaction_string method in users_helper.rb to find most recent transactions and return an array of transaction strings for the view.
Merge branch 'feature-backend-transaction' into develop
Completed transaction backend.
Added user and transactions to seed.
Merge branch 'update-seed-file' into develop
Updated seed file, ready for use.