Project Byzantium has released a version of thier software package for the RPi. Its not an ISO but they have a GIT repository and a description of how to impliment it.
Project Byzantium is a thumbdrive based Linux distribution that will turn most PC's into WiFi mesh network node along with a few bells and whistles. The RPi version isn't a full distibution yet, but rather is a series of add-ons for Raspberian and instrustion for Arch Linux as well. The RPi version doesn't do everything that PC version does but it has the core features. Below are the links if anyone is interested:
Project Home Page:
GIT Repository:
https://github.com/Byzantium/ByzPi
Blog/News Article
http://project-byzantium.org/isc-grant-milestone-number-one-achieved/
FYI: they also have a version coming out soon for Mac as well.