Remove some commented-out code
spec(github-status): add spec testing the no-tokens case

This tests the bug that 5767fd6dfe720830c1ae73ca5f4bf8b45d650c99 fixed.
github-status: have #tokens return a Hash in all cases

The #tokens method returns a Hash of username-token key-value pairs, and
while returning an empty array doesn't really break anything since that
means the task won't be handled, I think it's good to always return the
same type for consistency.