Specified a new layout for SingleForecastFragment

Added
 - (replaced) forecast_fragment.xml with more TextViews for each weather
 condition we want to display, and one ImageView to display a Bitmap
 - replaced earlier String data with strings for temperature, feelsLike,
 humidity, chanceOfPrecipitation
 - parseForecast now uses (above) new strings to store conditions
 - listener needs to be called with (above) new strings instead of data
 - changed onForecastLoaded to accept multiple strings and a bitmap, and
 set these the to relevant views
 - (above) relevant views have to be fetched onCreateView