Date picker bugs solved

1:Removed "calendarView" from datePicker, now we can select year.

2: Min date to show images after is now one year before the current date; and max date is the current date.

3: Min date to show images before is now the current date; max is the date chosen to display images after

4: Default time window is set ranging from 1 year ago up to now.

5: 500px now fetches images based on location and range perfectly (!) (no more porn!)

6: Images now show whenever gps gets coordinates (triggered by "onLocationChanged" instead of being asked by a timer in the app)

7: Everytime a new image search is done, the list is renewed to avoid photos that are not related to the search to appear

Comments:
 App is handling memory way better now because of 7.

Images load much faster now because of 6.