Merge branch 'master' of github.com:openlayers/ol3 into vector

src/ol/layer/imagelayer.exports

@@ -0,0 +1 @@
+@exportClass ol.layer.ImageLayer ol.layer.LayerOptions

src/ol/layer/imagelayer.js

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+goog.provide('ol.layer.ImageLayer');
+
+goog.require('ol.layer.Layer');
+goog.require('ol.source.ImageSource');
+
+
+
+/**
+ * @constructor
+ * @extends {ol.layer.Layer}
+ * @param {ol.layer.LayerOptions} layerOptions Layer options.
+ */
+ol.layer.ImageLayer = function(layerOptions) {
+  goog.base(this, layerOptions);
+};
+goog.inherits(ol.layer.ImageLayer, ol.layer.Layer);
+
+
+/**
+ * @return {ol.source.ImageSource} Single image source.
+ */
+ol.layer.ImageLayer.prototype.getImageSource = function() {
+  return /** @type {ol.source.ImageSource} */ (this.getSource());
+};