Added model file to wrap YahooFinance gem functionality
added methods to the YahooFinanceWrapper model for realtime and extended 'get quote' methods
added two methods to YahooFinanceWrapper to get historical quote data with either number of days or start and end dates. YahooFinance methods used by Scato are now encapsulated within the YahooFinanceWrapper model.
Modified the Ticker model to reference the Yahoo wrapper methods.
Removed the 'dependent: :destroy' option on the price history relationship to keep historical data for analysis purposes.
added methods 'get_activity' to PriceHistory, and 'get_day_stats', 'save_price_history' to Ticker.  I also tried to install FactoryGirl and Copybara for testing but may need help with that
added 3 user factory objects of different user types for testing
refactoring Ticker Model, adding psuedo-code for required methods to pass 'Doji?' test because methods require information from multiple models.  Added contants to YahooFinanceWrapper model.