[NAVAND-2844] Improve array creation while parsing (#1582)

Author: holuss

services-geojson/src/main/java/com/mapbox/geojson/BaseCoordinatesTypeAdapter.java

@@ -71,7 +71,7 @@ protected List<Double> readPointList(JsonReader in) throws IOException {
       throw new NullPointerException();
     }
 
-    List<Double> coordinates = new ArrayList<Double>();
+    List<Double> coordinates = new ArrayList<Double>(3);
     in.beginArray();
     while (in.hasNext()) {
       coordinates.add(in.nextDouble());

services-geojson/src/main/java/com/mapbox/geojson/gson/BoundingBoxTypeAdapter.java

@@ -60,7 +60,7 @@ public void write(JsonWriter out, BoundingBox value) throws IOException {
   @Override
   public BoundingBox read(JsonReader in) throws IOException {
 
-    List<Double> rawCoordinates = new ArrayList<Double>();
+    List<Double> rawCoordinates = new ArrayList<Double>(6);
     in.beginArray();
     while (in.hasNext()) {
       rawCoordinates.add(in.nextDouble());