Limit revisions in WordPress 3.6

In WP older than 3.6 it´s possible to deactivate or limit revisions in WordPress with the entry

define('WP-POST_REVISIONS', 100);

It seems that it is not working any longer in WP 3.6. Fortunately there is a nice little plugin that works very reliable and is able to delete a whole bunch of old revisions between two dates:

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"Enthusiastic Sim-Racer from the north of germany. I write here about web development, hardware, software and latest motion simulator technologies."