Data science 20141007 rc

Revisions based on Pull Request: https://github.com/jmmastey/level_up_exercises/pull/150

-clean up errors with main file
-add test_no_winner json data and tests
-convert main.rb into a Results class which takes the calculations from Dataset and wraps in some nice output
-using Hirb gem to format the console output
when you do single expectation tests (multiple its for you) instead use 
it "correctly deduces the conversion percentage" do
 expect(thing).to yadda yadda
 expect(thing).to yadda yadda
end
which will take out the need to write multiple its and help identify your tests