Implemeted the score calculation, close #10.
Merge branch 'master' of github.com:TakenokoChocoHolic/wpcs into #10_FixScoreCalculate
Make a new method for the score calculation and rename default_score to max_score in order to be more understandable, close #10.
Merge pull request #36 from TakenokoChocoHolic/#10_FixScoreCalculate

Implemeted the score calculation, close #10.