Support delete with limits

Requirement

Add support for limiting the number of entities that are deleted by the delete commands.

Value Proposition

In some cases you may need to only delete a single item that matches a condition. Right now, it is necessary to use the where command to load the entity from the database and then pass that entity to the delete command.

Design Ideas

The simplest approach is to add an optional parameter on the delete command to take a limit value.

Note: Does it make sense to have a limit without an order? #21