Adds support for polyline6 (#287)

* Added support for precision 6

* made antonio's changes

* fixed test

Makefile

@@ -83,9 +83,14 @@ geocoding-batch-fixtures:
 		-o mapbox/libjava-services/src/test/fixtures/geocoding_batch.json
 
 directions-fixtures:
+	# Directions: polyline geometry with precision 5
 	curl "https://api.mapbox.com/directions/v5/mapbox/driving/-122.416667,37.783333;-121.900000,37.333333?geometries=polyline&steps=true&access_token=$(MAPBOX_ACCESS_TOKEN)" \
 		-o mapbox/libjava-services/src/test/fixtures/directions_v5.json
 
+	# Directions: polyline geometry with precision 6
+	curl "https://api.mapbox.com/directions/v5/mapbox/driving/-122.416667,37.783333;-121.900000,37.333333?geometries=polyline6&steps=true&access_token=$(MAPBOX_ACCESS_TOKEN)" \
+		-o mapbox/libjava-services/src/test/fixtures/directions_v5_precision_6.json
+
 directions-traffic-fixtures:
 	curl "https://api.mapbox.com/directions/v5/mapbox/driving-traffic/-122.416667,37.783333;-121.900000,37.333333?geometries=polyline&steps=true&access_token=$(MAPBOX_ACCESS_TOKEN)" \
 		-o mapbox/libjava-services/src/test/fixtures/directions_v5_traffic.json

mapbox/libjava-services/src/main/java/com/mapbox/services/api/directions/v5/DirectionsCriteria.java

@@ -42,12 +42,19 @@ public class DirectionsCriteria {
   public static final String PROFILE_CYCLING = "cycling";
 
   /**
-   * Format to return route geometry will be encoded polyline.
+   * Format to return route geometry will be an encoded polyline.
    *
    * @since 1.0.0
    */
   public static final String GEOMETRY_POLYLINE = "polyline";
 
+  /**
+   * Format to return route geometry will be an encoded polyline with precision 6.
+   *
+   * @since 2.0.0
+   */
+  public static final String GEOMETRY_POLYLINE6 = "polyline6";
+
   /**
    * Format to return route geometry will be geojson. Note that this isn't supported by the SDK.
    *

mapbox/libjava-services/src/main/java/com/mapbox/services/api/directions/v5/MapboxDirections.java

@@ -148,10 +148,22 @@ public Builder() {
       // Set defaults
       this.user = DirectionsCriteria.PROFILE_DEFAULT_USER;
 
-      // We only support polyline encoded geometries to reduce the size of the response.
-      // If we need the corresponding LineString object, this SDK can do the decoding with
-      // LineString.fromPolyline(String polyline, int precision).
-      this.geometries = DirectionsCriteria.GEOMETRY_POLYLINE;
+      // by defauly the geometry is polyline with precision 6.
+      this.geometries = DirectionsCriteria.GEOMETRY_POLYLINE6;
+    }
+
+    /**
+     * The SDK currently only supports {@code Polyline} geometry (not GeoJSON) to simplify the response. You do have
+     * the option on whether the precision is 5 or 6 using either {@link DirectionsCriteria#GEOMETRY_POLYLINE} or
+     * {@link DirectionsCriteria#GEOMETRY_POLYLINE6}.
+     *
+     * @param geometries A {@code String} constant which equals either {@code "polyline"} or {@code "polyline6"}.
+     * @return Builder
+     * @since 2.0.0
+     */
+    public Builder setGeometry(String geometries) {
+      this.geometries = geometries;
+      return this;
     }
 
     /*
@@ -378,7 +390,8 @@ public Boolean isAlternatives() {
 
     /**
      * @return {@link com.mapbox.services.api.directions.v5.DirectionsCriteria#GEOMETRY_GEOJSON},
-     * {@link com.mapbox.services.api.directions.v5.DirectionsCriteria#GEOMETRY_POLYLINE}
+     * {@link com.mapbox.services.api.directions.v5.DirectionsCriteria#GEOMETRY_POLYLINE},
+     * or {@link com.mapbox.services.api.directions.v5.DirectionsCriteria#GEOMETRY_POLYLINE6}
      * @since 1.0.0
      */
     public String getGeometries() {