[Courier] added source.get() and a stub for ._resolveIndexPattern()

src/courier/data_source/data_source.js

@@ -62,6 +62,14 @@ define(function (require) {
    * PUBLIC API
    *****/
 
+  /**
+   * Get values from the state
+   * @param {string} name - The name of the property desired
+   */
+  DataSource.prototype.get = function (name) {
+    return this._state[name];
+  };
+
   /**
    * fetch the field names for this DataSource
    * @param  {Function} cb
@@ -156,5 +164,12 @@ define(function (require) {
     return flatState;
   };
 
+  DataSource.prototype._resolveIndexPattern = function (start, end) {
+    if (this._state.indexInterval) {
+      throw new Error('Not implemented');
+    }
+    return this._state.index;
+  };
+
   return DataSource;
 });