fixed mako renderer returning a tuple with a previous defname value in some circumstances
added mako renderer test
added deprecation warning for mako tuple
resolve conflicts
When running the alchemy scaffold on MySQL an error is generated on table
creation:

sqlalchemy.exc.OperationalError: (OperationalError) (1170, "BLOB/TEXT column 'name' used in key specification without a key length") '\nCREATE TABLE models (\n\tid INTEGER NOT NULL AUTO_INCREMENT, \n\tname TEXT, \n\tvalue INTEGER, \n\tPRIMARY KEY (id), \n\tUNIQUE (name)\n)\n\n' ()

MySQL (and MariaDB) doesn't allow an index of more than 255 characters. After
modifying the scaffold and creating a project, the following results:

> show create table models;
+--------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table  | Create Table                                                                                                                                                                                                                       |
+--------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| models | CREATE TABLE `models` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` text,
  `value` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `my_index` (`name`(255))
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=latin1 |
+--------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

A unique index is created on the name field, constrained to 255 characters.

When run on SQLite3:

sqlite> .schema models
CREATE TABLE models (
	id INTEGER NOT NULL,
	name TEXT,
	value INTEGER,
	PRIMARY KEY (id)
);
CREATE UNIQUE INDEX my_index ON models (name);

the mysql specific constraint is ignored and the table is created with a unique
index as desired.
add change note for backport
backport for #718 to 1.4-branch