Prevent fatal when running resque-web engine with ruby 2.1.2 and rails 4.

Getting this error when doing the steps in the Readme:

Uncaught exception: uninitialized constant Resque
	/Users/atkon/.rvm/gems/ruby-2.1.2@allplayers-resque-web/gems/resque-web-0.0.6/config/initializers/resque_config.rb:2:in `<top (required)>'