Added getResolutions() function to ol.View

New getResolutions() function created for ol.View. This function returns
the array of resolutions passed to the ol.View constructor, or undefined
if none were given.

src/ol/view.js

@@ -134,6 +134,12 @@ ol.View = function(opt_options) {
    */
   this.minResolution_ = resolutionConstraintInfo.minResolution;
 
+  /**
+   * @private
+   * @type {Array.<number>|undefined}
+   */
+  this.resolutions_ = options.resolutions;
+
   /**
    * @private
    * @type {number}
@@ -313,6 +319,17 @@ ol.View.prototype.getResolution = function() {
 };
 
 
+/**
+ * Get the resolutions for the view. This returns the array of resolutions
+ * passed to the constructor of the {ol.View}, or undefined if none were given.
+ * @return {Array.<number>|undefined} The resolutions of the view.
+ * @api stable
+ */
+ol.View.prototype.getResolutions = function() {
+  return this.resolutions_;
+};
+
+
 /**
  * Get the resolution for a provided extent (in map units) and size (in pixels).
  * @param {ol.Extent} extent Extent.