Downgraded JRuby to 1.7.17 as per Travis issue #3067.

jdantonio · jdantonio · commit bd100f8a17e4 · 2015-01-01T13:24:00.000-05:00
diff --git a/.travis.yml b/.travis.yml
@@ -6,7 +6,7 @@ rvm:
   - 2.0.0
   - 1.9.3
   - ruby-head
-  - jruby-1.7.18
+  - jruby-1.7.17
   - jruby-head
   - rbx-2
 
