Removing abstract methods for now

Later we'll discuss having more specific FeatureParser and readFeatures type methods.

src/ol/parser/parser.js

@@ -6,16 +6,3 @@ goog.provide('ol.parser.Parser');
  * @constructor
  */
 ol.parser.Parser = function() {};
-
-/**
- * @param {*} data Data to deserialize.
- * @return {*} Parsed data.
- */
-ol.parser.Parser.prototype.read = goog.abstractMethod;
-
-
-/**
- * @param {*} obj Object to serialize.
- * @return {*} Serialized object.
- */
-ol.parser.Parser.prototype.write = goog.abstractMethod;