Found an error in Rails 3.2+ that caused rake init task to fail.

Just started using this gem and found a simple error being thrown from the rake task because the module mistaken `Rails.application.eager_load!` as `Redis::Rails::Module`.

The simple fix here is to just do
```ruby
::Rails.application.eager_load!
```

Sorry for a few messy commits before the fix. Carless by me.