Change Travis JRuby to default and allow failures.

Author: gkellogg

.travis.yml

@@ -6,10 +6,13 @@ env:
 rvm:
   - 2.2.5
   - 2.3.1
-  - jruby-9.1.2.0
+  - jruby
   - rbx
 cache: bundler
 sudo: false
 addons:
   code_climate:
     repo_token: 5806cc8a21c03f4e2f9d3b9d98d5d9fe084b66243b1dbb27b467dbc795acdcac
+matrix:
+  allow_failures:
+    - rvm: jruby