Removed leftover TODO
Remove pg (postgres) dependency
Remove readme reference from package.json

It was causeing error messages from `npm install`
Clean up script output formatting

loadAccounts no longer prints account name separately.
listAccounts no longer prints account IDs
Updated getBalance return value formatting

Name field "balance" instead of "SUM(amount)"
Converted data access functions to return promises

Instead of using callbacks.
Simplify accountRef resolution
Fix example json formatting

Use double quotes and remove a comma from budget.json
Load all examples in loadTransactions.sh