Build/Test tools: Trim the test matrix on Travis in order to speed up the 4.4 branch build.

This removes all allowed failure jobs, plus PHP 5.3, 5.4, and 5.5 jobs.

See #40407


git-svn-id: https://develop.svn.wordpress.org/branches/4.4@40410 602fd350-edb4-49c9-b593-d223f7449a82

.travis.yml

@@ -9,26 +9,13 @@ matrix:
     env: WP_TRAVISCI=travis:js
   - php: 5.2
     env: WP_TRAVISCI=travis:phpunit
-  - php: 5.3
-    env: WP_TRAVISCI=travis:phpunit
-  - php: 5.4
-    env: WP_TRAVISCI=travis:phpunit
-  - php: 5.5
-    env: WP_TRAVISCI=travis:phpunit
   - php: 5.6
     env: WP_TRAVISCI=travis:phpunit
   - php: 5.6
     env: WP_TRAVISCI=travis:phpunit WP_TRAVIS_OBJECT_CACHE=true
     services: memcached
-  - php: hhvm
-    env: WP_TRAVISCI=travis:phpunit
   - php: 7.0
     env: WP_TRAVISCI=travis:phpunit
-  - php: nightly
-    env: WP_TRAVISCI=travis:phpunit
-  allow_failures:
-  - php: hhvm
-  - php: nightly
 before_install:
 - WP_CORE_DIR=/tmp/wordpress/
 - git clone https://github.com/WordPress/twentysixteen.git src/wp-content/themes/twentysixteen