Update karma_calculator_spec file

My story: https://www.pivotaltracker.com/story/show/82978024
I wrote an it block to make every statement executed al least once. Thus increase coverage of the test. Only the changes to karma_calculator_spec relates to the chores. Other changes I made is my setup attempts and coverage testing on my machines.
yes rename it, though in its current state, it is testing many things at once. Try to break them up so we can summarize what is being tested in one line.