Move normal ruby versions back to the rvm section

* Without this change travis does another 1.9.3 run

.travis.yml

@@ -2,12 +2,13 @@ language: ruby
 before_install: gem install bundler
 bundler_args: --without yard guard benchmarks
 script: "bundle exec rake ci"
+rvm:
+  - 1.9.3
+  - 2.0.0
+  - ruby-head
+  - rbx-19mode
 matrix:
   include:
-    - rvm: 1.9.3
-    - rvm: 2.0.0
-    - rvm: ruby-head
-    - rvm: rbx-19mode
     - rvm: jruby-19mode
       env: JRUBY_OPTS="$JRUBY_OPTS --debug"
     - rvm: jruby-head