Output rework

Change the output of each command to simply output each git command in bold and the output of that command immediately after. 

Cleanup error messages to follow suit of what `git rebase` errors look like (but print in red to easily catch the eye).

To get a look, run a single cucumber test with the commands printed out.
 `cucumber features/git-ship.feature:3 DEBUG=true`
I disagree with the extra white space. I don't see the aid in having extra white space at the start and end. I've never seen any other commands do something like that.