Rollback trusty to precise
Rollback trusty to precise

precise (https://travis-ci.org/sue445/index_shotgun/jobs/268298728) is successful,
but trusty (https://travis-ci.org/sue445/index_shotgun/jobs/271175914) is failed.

```
+bundle exec rspec
Access denied for user 'travis'@'%' to database 'index_shotgun_test'
/home/travis/build/sue445/index_shotgun/gemfiles/vendor/bundle/ruby/2.1.0/gems/mysql2-0.4.9/lib/mysql2/client.rb:89:in `connect'
/home/travis/build/sue445/index_shotgun/gemfiles/vendor/bundle/ruby/2.1.0/gems/mysql2-0.4.9/lib/mysql2/client.rb:89:in `initialize'
/home/travis/build/sue445/index_shotgun/gemfiles/vendor/bundle/ruby/2.1.0/gems/activerecord-4.2.9/lib/active_record/connection_adapters/mysql2_adapter.rb:18:in `new'
```

sue445/index_shotgun,sue445/index_shotgun