Test against JRuby in Ruby 2.0-mode and Ruby 2.1-mode

.travis.yml

@@ -4,11 +4,18 @@ gemfile:
   - Gemfile.rack-1.3.x
 language: ruby
 rvm:
-  - rbx-18mode
-  - rbx-19mode
-  - jruby-18mode
-  - jruby-19mode
   - 1.8.7
   - 1.9.2
   - 1.9.3
   - 2.0.0
+  - jruby-18mode
+  - jruby-19mode
+  - jruby-20mode
+  - jruby-21mode
+  - jruby-head
+  - rbx-18mode
+  - rbx-19mode
+matrix:
+  allow_failures:
+    - rvm: jruby-head
+  fast_finish: true

README.md

@@ -144,8 +144,7 @@ your first stop if you are wondering about a more in-depth look at
 OmniAuth, how it works, and how to use it.
 
 ## Supported Ruby Versions
-OmniAuth is tested under 1.8.7, 1.9.2, 1.9.3, 2.0.0, JRuby (1.8 mode), and Rubinius
-(1.8 and 1.9 modes).
+OmniAuth is tested under 1.8.7, 1.9.2, 1.9.3, 2.0.0, JRuby, and Rubinius (1.8 and 1.9 modes).
 
 ## Versioning
 This library aims to adhere to [Semantic Versioning 2.0.0][semver]. Violations