[dm-migrations] Do not use quote_table_name or quote_column_name

* Updated to lookup schema details in adapter type_map using the primitive
  class if it is a custom type

lib/sql/table_creator.rb

@@ -64,7 +64,8 @@ def build_type(type_class)
         if type_class.is_a?(String)
           schema[:primitive] = type_class
         else
-          schema = @adapter.class.type_map[type_class].merge(schema)
+          primitive = type_class.respond_to?(:primitive) ? type_class.primitive : type_class
+          schema = @adapter.class.type_map[primitive].merge(schema)
         end
         @adapter.send(:with_connection) do |connection|
           @adapter.property_schema_statement(connection, schema)

lib/sql/table_modifier.rb

@@ -41,11 +41,11 @@ def change_column(name, type, opts = {})
     end
 
     def quote_column_name(name)
-      @adapter.send(:quote_column_name, name.to_s)
+      @adapter.send(:quote_name, name.to_s)
     end
 
     def quoted_table_name
-      @adapter.send(:quote_table_name, table_name)
+      @adapter.send(:quote_name, table_name)
     end
 
   end