Maybe fix Travis CI builds?

Author: ianmjones

.travis.yml

@@ -10,8 +10,8 @@ php:
 env:
   - WP_VERSION=3.9 WP_MULTISITE=0
   - WP_VERSION=3.9 WP_MULTISITE=1
-  - WP_VERSION=latest WP_MULTISITE=0
-  - WP_VERSION=latest WP_MULTISITE=1
+  - WP_VERSION=4.6 WP_MULTISITE=0
+  - WP_VERSION=4.6 WP_MULTISITE=1
 
 services:
   - mysql

tests/cfg/bootstrap.php

@@ -22,4 +22,3 @@ function _manually_load_options_pixie_plugin() {
 require $_tests_dir . '/includes/bootstrap.php';
 
 define( 'PHPUNIT_RUNNER', true );
-define( 'WP_DEFAULT_THEME', 'default' );