v1.2.0

• Changed scoring function to compute memory capacity using Fukuda and Vogel's formula, K = S (H - F).
• Added hit rate and false alarm rate values to the database.
• Added full set of correct and user answers to the database.
• Changed vwm_score to vwm_capacity in database to better represent the measure.
• Updated console log to represent memory capacity and total correct answers in the test page.
• Added explanation of the saved data in the README.