Add missing @Override annotations (#617)

vtm-app/src/org/osmdroid/location/FlickrPOIProvider.java

@@ -149,6 +149,7 @@ public class FlickrPOIProvider implements POIProvider {
      * Null if
      * technical issue.
      */
+    @Override
     public ArrayList<POI> getPOIInside(BoundingBox boundingBox, String query, int maxResults) {
         String url = getUrlInside(boundingBox, maxResults);
         return getThem(url);

vtm-app/src/org/osmdroid/location/FourSquareProvider.java

@@ -137,6 +137,7 @@ public class FourSquareProvider implements POIProvider {
      * Null if
      * technical issue.
      */
+    @Override
     public ArrayList<POI> getPOIInside(BoundingBox boundingBox, String query, int maxResults) {
         String url = getUrlInside(boundingBox, query, maxResults);
         return getThem(url);

vtm-app/src/org/osmdroid/location/NominatimPOIProvider.java

@@ -150,6 +150,7 @@ public class NominatimPOIProvider implements POIProvider {
      * @param maxResults  ...
      * @return list of POIs, null if technical issue.
      */
+    @Override
     public ArrayList<POI> getPOIInside(BoundingBox boundingBox, String type, int maxResults) {
         String url = getUrlInside(boundingBox, type, maxResults);
         return getThem(url);

vtm-app/src/org/osmdroid/location/PicasaPOIProvider.java

@@ -95,6 +95,7 @@ public class PicasaPOIProvider implements POIProvider {
      * @return list of POI, Picasa photos inside the bounding box. Null if
      * technical issue.
      */
+    @Override
     public List<POI> getPOIInside(BoundingBox boundingBox, String query, int maxResults) {
         String url = getUrlInside(boundingBox, maxResults, query);
         return getThem(url);