In H-REAP you will create an SSID and enable local switching. The interface you map that to will be the management. In the H-REAP tab, you define the native vlan and hit apply and then you click vlan mapping and define the local vlan the users who associate to the ssid will be on. The router will provide dhcp, so make sure you have the the router IP defined ad the primary dhcp on the ssid.
Remember to create a 802.1q trunk with the native vlan being the vlan the management IP of the h-reap AP is on.
I run the 4.2.66 code since I'm using the 1252 AP's and it seem to be working fine. I have tested the 4.2.99 and 4.2.112 in a lab environment and that seems to be okay to, but that is a lab.
Hope this helps.