Run AngularJS and piwik.js tests on PHP 5.6 for consistency as there is no...

Run AngularJS and piwik.js tests on PHP 5.6 for consistency as there is no added benefit to use 5.3 for this

.travis.yml

@@ -69,12 +69,12 @@ matrix:
     - php: hhvm
       env: TEST_SUITE=AllTests MYSQL_ADAPTER=MYSQLI
     # Javascript tests need to run only on one PHP version
-    - php: 5.6
+    - php: 5.3.3
       env: TEST_SUITE=JavascriptTests MYSQL_ADAPTER=PDO_MYSQL
     - php: hhvm
       env: TEST_SUITE=JavascriptTests MYSQL_ADAPTER=PDO_MYSQL
     # AngularJS tests need to run only on one PHP version
-    - php: 5.6
+    - php: 5.3.3
       env: TEST_SUITE=AngularJSTests MYSQL_ADAPTER=PDO_MYSQL
     - php: hhvm
       env: TEST_SUITE=AngularJSTests MYSQL_ADAPTER=PDO_MYSQL