more go fmt
Update gitignore
Add a test database and an account test
Test ListUsers
Use github.com/stretchr/testify for assertions

Soooo much less typing.
Rename test_utils to utils_test

Not sure if this is a good or a bad idea: exclude test_utils from
regular builds. Seems nice to prevent calling test code from a real
build. Seems weird to put non-tests in a *_test file.