Timeout with a lot of revisions

We just added a 2.x version of the module. This is a complete rewrite based on plugins to determine which revisions can be deleted. It also uses a queue worker to actually delete revisions. Could you please test if this solves the timeout issues you currently experience?

We have an older D7 site that also give me grief, 4GB memory is not enough on 7.x-3.2. No timeouts, but run out of memory and is a general performance problem.

Entering this part consume a lot of memory.

```
module_invoke($module = 'node_revision_delete', $hook = 'cron')

```

To allow cron to finish I had to return early.

function node_revision_delete_cron() {
  return;

Just to make sure the rest of the cron tasks works as expected.

what about 28 000 000 rows in node_revision_body and 8 more revision-related tables?

so I have 9 tables, and every table contains around 30 000 000 records, how to speed up the process and make it work with this module way faster?

Closing because the current development is being made in branch 2.x