try one more gem update system trick with travis-ci

Author: kares

.travis.yml

@@ -3,8 +3,7 @@ bundler_args: --without development
 script: bundle exec rake test_$DB
 before_script: export JRUBY_OPTS="--server -Xcext.enabled=false -Xcompile.invokedynamic=false"
 before_install:
-  #- gem update --system 2.1.11
-  #- 'ruby -e "puts RUBY_VERSION" | grep ^1\.8 && gem update --system -v 2.1.11 || true'
+  - jruby --1.9 -S gem update --system 2.1.11
 rvm:
   - jruby
 gemfile: