leave assignee as name_expression in assignment, fix tests accordingly

lib/ast/basic_expressions.rb

@@ -29,7 +29,7 @@ module Ast
       variable
     end
     def inspect
-      self.class.name + ".new(" + name + ")"
+      self.class.name + '.new("' + name + '")'
     end
     def attributes
       [:name]

lib/ast/operator_expressions.rb

@@ -31,7 +31,7 @@ module Ast
       @assignee, @assigned = assignee, assigned
     end
     def inspect
-      self.class.name + ".new(" + assignee + ", " + assigned.inspect+ ")"
+      self.class.name + ".new(" + assignee.inspect + ", " + assigned.inspect + ")"
     end
     
     def compile context

lib/parser/transform.rb

@@ -39,7 +39,7 @@ module Parser
           end
     
     rule(:asignee => simple(:left) , :asigned => simple(:right) ) do
-      Ast::AssignmentExpression.new(left.name, right ) 
+      Ast::AssignmentExpression.new(left , right ) 
     end
     #shortcut to get the ast tree for a given string
     # optional second arguement specifies a rule that will be parsed (mainly for testing)