Update to JRuby 9K

Even though JRuby 9K on Travis still apparently points to pre1 we are updating so that when it finally points to stable release we can get those builds, once jruby-head diverges enough again we will re-add it to the list and start testing the next build and move JRuby 9K.  Remember though, JRuby support is still experimental.

.travis.yml

@@ -5,10 +5,10 @@ rvm:
 - 2.2
 - 2.1
 - 2.0
-- jruby-head
+- jruby-9.0.0.0
 matrix:
   allow_failures:
-    - rvm: jruby-head
+    - rvm: jruby-9.0.0.0
 env:
   matrix:
     - TEST_SUITE=test