Fix broken validation messages

A typo in hallelujah#122 appears to
have introduced an error here that's causing a large number of test
failures.

Closes hallelujah#124, closes hallelujah#123, fixes hallelujah#120

lib/valid_email/email_validator.rb

@@ -22,7 +22,7 @@ def validate_each(record,attribute,value)
     end
     unless r
       msg = (options[:message] || I18n.t(:invalid, :scope => "valid_email.validations.email"))
-      record.errors.add attribute, message: I18n.interpolate(msgs, value: value)
+      record.errors.add attribute, message: I18n.interpolate(msg, value: value)
     end
   end
 end