start storing wind data from Spitcast, organize the path data takes from an instance of SpotLibrary to an instance of YourSpotsCell

- started downloading wind data for each county from Spitcast and saving the data in countyDataDictionary
- YourSpotsTableViewController and YourSpotsCell were doing a lot of work to navigate the data stored in SpotLibrary, so I added a method to SpotLibrary that handles returning the swell data displayed in a YourSpotsCell and lightened the code in YourSpotsTableViewController and YourSpotsCell