Added a simple example demonstrating how to use cosmic-ray to improve a test suite.

[abingham]

This is a rebasing and simplification of a set of changes by @trbedwards.

[abingham]

@trbedwards Can you look this over and let me know if it looks correct to you?

[codecov-io]

Codecov Report

Merging #323 into master will decrease coverage by 0.24%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #323      +/-   ##
=========================================
- Coverage   83.04%   82.8%   -0.25%     
=========================================
  Files          44      44              
  Lines        1280    1291      +11     
  Branches      124     129       +5     
=========================================
+ Hits         1063    1069       +6     
- Misses        200     203       +3     
- Partials       17      19       +2

Flag	Coverage Δ
#py34	82.64% <ø> (-0.25%)	⬇️
#py35	82.49% <ø> (-0.25%)	⬇️
#py36	82.49% <ø> (-0.25%)	⬇️
#pynightly	82.49% <ø> (-0.25%)	⬇️

Impacted Files	Coverage Δ
cosmic_ray/reporting.py	43.66% <0%> (+1.99%)	⬆️

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[blueyed]

Comment needs to get updated?!

[blueyed]

Should this (bowling_game_score_calculator) be in here (this PR) after all?

[abingham]

That comment is cruft; I've removed it.

I think the bowling_game_score_calculator was part of the same documentation effort from the PyCon UK sprint. @trbedwards: was this intended to be in the same PR as simple_math? I may have messed up the rebasing or something.