Updated to address concerns expressed in comments

Based on Oral Solution Pack's approach

.travis.yml

@@ -1,9 +1,16 @@
 sudo: required
 dist: trusty
 language: php
+php:
+  - 5.4
+  - 5.5
+  - 5.6
+  - 7.0
+  - 7.1
+
 matrix:
   include:
-   #5.3.3 Precise block
+   #5.3.3 Ubuntu Precise exceptions
     - php: 5.3.3
       dist: precise
       env: FEDORA_VERSION="3.5"
@@ -16,51 +23,12 @@ matrix:
     - php: 5.3.3
       dist: precise
       env: FEDORA_VERSION="3.8.1"
-   # 5.4 Trusty block      
+env:
-    - php: 5.4
+  - FEDORA_VERSION="3.5"
-      env: FEDORA_VERSION="3.5"
+  - FEDORA_VERSION="3.6.2"
-    - php: 5.4
+  - FEDORA_VERSION="3.7.0"
-      env: FEDORA_VERSION="3.6.2"
+  - FEDORA_VERSION="3.8.1"
-    - php: 5.4
+
-      env: FEDORA_VERSION="3.7.0"
-    - php: 5.4
-      env: FEDORA_VERSION="3.8.1"  
-  # 5.5 Trusty block      
-    - php: 5.5
-      env: FEDORA_VERSION="3.5"
-    - php: 5.5
-      env: FEDORA_VERSION="3.6.2"
-    - php: 5.5
-      env: FEDORA_VERSION="3.7.0"
-    - php: 5.5
-      env: FEDORA_VERSION="3.8.1"
-  # 5.6 Trusty block      
-    - php: 5.6
-      env: FEDORA_VERSION="3.5"
-    - php: 5.6
-      env: FEDORA_VERSION="3.6.2"
-    - php: 5.6
-      env: FEDORA_VERSION="3.7.0"
-    - php: 5.6
-      env: FEDORA_VERSION="3.8.1"
-  # 7.0 Trusty block      
-    - php: 7.0
-      env: FEDORA_VERSION="3.5"
-    - php: 7.0
-      env: FEDORA_VERSION="3.6.2"
-    - php: 7.0
-      env: FEDORA_VERSION="3.7.0"
-    - php: 7.0
-      env: FEDORA_VERSION="3.8.1"
-  # 7.1 Trusty block      
-    - php: 7.1
-      env: FEDORA_VERSION="3.5"
-    - php: 7.1
-      env: FEDORA_VERSION="3.6.2"
-    - php: 7.1
-      env: FEDORA_VERSION="3.7.0"
-    - php: 7.1
-      env: FEDORA_VERSION="3.8.1"    
 branches:
   only:
     - /^7.x/