Refining of App

-Loads Different Resolution Image for the Weather depending on the
screen resolution
-No repetition of commas when the found city is stateless: e.g. Warsaw,
,Poland instead of Warsaw, Poland
-Added a Activity Loading Spinner for both City fetching and weather
fetching
-Fixed the XML in the UI of the ActivityForecast so that it loads
better on a  variety of screens by using  a linear layout and gravity
centre (with the help of Tomasz R)
-Content now only shows when everything has been completely loaded so
that there is no jagged loading and resizing between the default
strings and images and the fetched data