Run Rails 5 first in Travis CI. TODO: rationalise/dry up the matrix.

.travis.yml

@@ -10,6 +10,10 @@ rvm:
   - 1.9
 
 env:
+  - RAILS=5-0-stable DB=sqlite3
+  - RAILS=5-0-stable DB=mysql
+  - RAILS=5-0-stable DB=postgres
+
   - RAILS=4-2-stable DB=sqlite3
   - RAILS=4-2-stable DB=mysql
   - RAILS=4-2-stable DB=postgres
@@ -31,21 +35,29 @@ env:
   - RAILS=3-1-stable DB=postgres
 
 matrix:
+  exclude:
+    - rvm: 2.1.10
+      env: RAILS=5-0-stable DB=sqlite3
+    - rvm: 2.1.10
+      env: RAILS=5-0-stable DB=mysql
+    - rvm: 2.1.10
+      env: RAILS=5-0-stable DB=postgres
+
+    - rvm: 2.0
+      env: RAILS=5-0-stable DB=sqlite3
+    - rvm: 2.0
+      env: RAILS=5-0-stable DB=mysql
+    - rvm: 2.0
+      env: RAILS=5-0-stable DB=postgres
+
+    - rvm: 1.9
+      env: RAILS=5-0-stable DB=sqlite3
+    - rvm: 1.9
+      env: RAILS=5-0-stable DB=mysql
+    - rvm: 1.9
+      env: RAILS=5-0-stable DB=postgres
+
   include:
-    - rvm: 2.3.1
-      env: RAILS=5-0-stable DB=sqlite3
-    - rvm: 2.3.1
-      env: RAILS=5-0-stable DB=mysql
-    - rvm: 2.3.1
-      env: RAILS=5-0-stable DB=postgres
-
-    - rvm: 2.2.5
-      env: RAILS=5-0-stable DB=sqlite3
-    - rvm: 2.2.5
-      env: RAILS=5-0-stable DB=mysql
-    - rvm: 2.2.5
-      env: RAILS=5-0-stable DB=postgres
-
     - rvm: 2.3.1
       env: RAILS=master DB=sqlite3
     - rvm: 2.3.1