Removing cache check - double-adding classes has no downside beyond a…

… little extra time, and removes window for bugs/Rails version inconsistencies.

lib/thinking_sphinx/context.rb

@@ -7,7 +7,7 @@ def initialize
 
   def prepare
     load_models
-    add_indexed_models if cached?
+    add_indexed_models
   end
 
   def define_indexes
@@ -33,14 +33,6 @@ def superclass_indexed_models
 
   private
 
-  def cached?
-    return true if defined?(Merb)
-
-    defined?(Rails)                   &&
-    Rails::VERSION::STRING.to_f > 2.1 &&
-    Rails.configuration.cache_classes
-  end
-
   def add_indexed_models
     Object.subclasses_of(ActiveRecord::Base).each do |klass|
       add_indexed_model klass if klass.has_sphinx_indexes?