work around "rake db:create:all" error on JRuby SQLite3

work around "rake db:create:all" error on JRuby SQLite3

<pre>
$ bundle exec rake ci --trace
...
rake aborted!
stack level too deep
/home/xxxx/.rvm/gems/jruby-1.7.4/gems/activerecord-3.2.15/lib/active_record/railties/databases.rake:184:in `local_database?'
/home/xxxx/.rvm/gems/jruby-1.7.4/gems/activerecord-3.2.15/lib/active_record/railties/databases.rake:52:in `(root)'
org/jruby/RubyHash.java:1375:in `each_value'
/home/xxxx/.rvm/gems/jruby-1.7.4/gems/activerecord-3.2.15/lib/active_record/railties/databases.rake:38:in `(root)'
</pre>

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