complete rewrite towards a more object oriented approach
moved doubleAsCurrencyStyle method from Prices class (model) to the controller
source code cleanup
minor tweaks to UI
Converted Prices model to instance methods instead of class methods
Converted all prices instances to Prices * class. Add minimumDate code to pricesDatePicker.  Miscellaneous code cleanup and reformatting.  Converted MidwestISOFetcher to Prices * return type.