Change the create_versioned_table class method to ask the connection …

…if table_exists?. Fixes a bug that allows adapters that allow user owned prefixes for table names.

Signed-off-by: rick <technoweenie@gmail.com>

lib/acts_as_versioned.rb

@@ -409,7 +409,7 @@ def create_versioned_table(create_table_options = {})
               self.reset_column_information
             end
 
-            return if connection.tables.include?(versioned_table_name.to_s)
+            return if connection.table_exists?(versioned_table_name)
 
             self.connection.create_table(versioned_table_name, create_table_options) do |t|
               t.column versioned_foreign_key, :integer