Add definition and test for $.pjax.defaults property.

jquery.pjax/jquery.pjax-tests.ts

@@ -41,3 +41,16 @@ function test_disable() {
 function test_reload() {
     $.pjax.reload();
 }
+
+function test_defauluts() {
+    $.pjax.defaults = {
+        timeout: 650,
+        push: true,
+        replace: false,
+        type: 'GET',
+        dataType: 'html',
+        scrollTo: 0,
+        maxCacheLength: 20,
+        version: $.noop
+    };
+}

jquery.pjax/jquery.pjax.d.ts

@@ -58,6 +58,11 @@ interface JQueryStatic {
 }
 
 interface PjaxStatic {
+    /**
+     * PJAX default settings.
+     */
+    defaults: PjaxSettings;
+
     /**
      * Loads a URL with ajax, puts the response body inside a container, then pushState()'s the loaded URL.
      * Works just like $.ajax in that it accepts a jQuery ajax settings object (with keys like url, type, data, etc).