Add a method for querying the js-sdk's current 'request' function in case people want to wrap it

lib/matrix.js

@@ -82,6 +82,13 @@ module.exports.request = function(r) {
     request = r;
 };
 
+/**
+ * Return the currently-set request function.
+ */
+module.exports.getRequest = function() {
+    return request;
+};
+
 /**
  * Construct a Matrix Client. Similar to {@link module:client~MatrixClient}
  * except that the 'request', 'store' and 'scheduler' dependencies are satisfied.