Build/Test tools: Reverse the order in which the Travis jobs run.

As a general rule, this means the fastest test jobs now run first because each subsequent version of PHP is faster than the previous. When a committer is patiently waiting for a Travis build to complete, they are at least more likely to see unexpected failures earlier than they otherwise would.

In addition, this updates the JavaScript test job to run on PHP 7.1.

Props netweb

See #39705


git-svn-id: https://develop.svn.wordpress.org/trunk@40434 602fd350-edb4-49c9-b593-d223f7449a82

.travis.yml

@@ -9,16 +9,18 @@ env:
     - WP_TRAVISCI=travis:phpunit
 matrix:
   include:
-  - php: 7.0
+  - php: 7.1
     env: WP_TRAVISCI=travis:js
-  - php: 5.2
-  - php: 5.3
-  - php: 5.4
-  - php: 5.5
+  - php: 7.1
+  - php: 7.0
   - php: 5.6
   - php: 5.6
     env: WP_TRAVIS_OBJECT_CACHE=true
     services: memcached
+  - php: 5.5
+  - php: 5.4
+  - php: 5.3
+  - php: 5.2
   - php: hhvm
     sudo: required
     dist: trusty
@@ -29,8 +31,6 @@ matrix:
         - mysql-server-5.6
         - mysql-client-core-5.6
         - mysql-client-5.6
-  - php: 7.0
-  - php: 7.1
   - php: nightly
   allow_failures:
   - php: hhvm