Merge pull request #727 from Vydia/check-specific-class

check specfic class - VYD-15128

Author: andrehjr

lib/split.rb

@@ -24,7 +24,7 @@
 require "split/user"
 require "split/version"
 require "split/zscore"
-require "split/engine" if defined?(Rails)
+require "split/engine" if defined?(::Rails::Engine)
 
 module Split
   extend self
@@ -74,7 +74,7 @@ def cache(namespace, key, &block)
 end
 
 # Check to see if being run in a Rails application.  If so, wait until before_initialize to run configuration so Gems that create ENV variables have the chance to initialize first.
-if defined?(::Rails)
+if defined?(::Rails::Railtie)
   class Split::Railtie < Rails::Railtie
     config.before_initialize { Split.configure { } }
   end