Merge pull request #42 from ukutaht/clear-timing

Clear screen before running koans

lib/runner.ex

@@ -18,6 +18,7 @@ defmodule Runner do
   end
 
   def run(start_module) do
+    Display.clear_screen()
     start_idx = Enum.find_index(@modules, &(&1 == start_module))
     Enum.drop(@modules, start_idx)
     |> Enum.take_while(fn(mod) ->