visiting symbols in the SQL visitor

lib/arel/table.rb

@@ -54,7 +54,7 @@ def where condition
     end
 
     def project *things
-      tm.project *things
+      tm.project(*things)
     end
 
     def take amount

lib/arel/visitors/dot.rb

@@ -81,6 +81,7 @@ def visit_Arel_Attribute o
       alias :visit_Arel_Attributes_String :visit_Arel_Attribute
       alias :visit_Arel_Attributes_Time :visit_Arel_Attribute
       alias :visit_Arel_Attributes_Boolean :visit_Arel_Attribute
+      alias :visit_Arel_Attributes_Attribute :visit_Arel_Attribute
 
       def visit_Arel_Nodes_Equality o
         visit_edge o, "left"

lib/arel/visitors/to_sql.rb

@@ -129,6 +129,7 @@ def visit_Fixnum o; o end
 
       def visit_TrueClass o; quote(o) end
       def visit_String o; quote(o) end
+      def visit_Symbol o; quote(o) end
       def visit_Time o; quote(o) end
       def visit_Date o; quote(o) end