Update travis tests for Rails 5 beta 3 and ruby version 2.2.4 & 2.3.0

Author: lgebhardt

.travis.yml

@@ -2,15 +2,16 @@ language: ruby
 sudo: false
 env:
   - "RAILS_VERSION=4.1.0"
-  - "RAILS_VERSION=4.2.0"
-  - "RAILS_VERSION=5.0.0.beta1.1"
+  - "RAILS_VERSION=4.2.6"
+  - "RAILS_VERSION=5.0.0.beta3"
 rvm:
   - 2.0
   - 2.1
-  - 2.2.2
+  - 2.2.4
+  - 2.3.0
 matrix:
   exclude:
     - rvm: 2.0
-      env: "RAILS_VERSION=5.0.0.beta1.1"
+      env: "RAILS_VERSION=5.0.0.beta3"
     - rvm: 2.1
-      env: "RAILS_VERSION=5.0.0.beta1.1"
+      env: "RAILS_VERSION=5.0.0.beta3"