Aloha, funky time!
curl -i http://localhost:8080/transactions
curl -i http://localhost:8080/transactions/1
curl -i -X POST -H "Content-Type:application/json" -d '{"account":"http://localhost:8080/accounts/1","amount":12.3,"date":"2016-05-31T22:00:00.000+0000","description":"test","category":"http://localhost:8080/categories/1"}' http://localhost:8080/transactions