* Refactored the WeatherDataView into a ForecastFragment
* Added a ViewPager to activity_main that contains a list of 7 ForecastFragments, one for each day of the week (7 day forecast)
* Changed some id names for consistency
* All dimen / colour values are in their correct resource files
* Created the ForecastAdapter to drive the ViewPager
* Exposed the forecast data in MainActivity to make it available to the ForecastFragments