This repository contains manifest information to be used by the Repo version control tool - http://en.wikipedia.org/wiki/Repo_(script).
In order to get the latest and greatest from the Panopoly, you need to install Repo and then run the following commands in your Drupal root:
repo init -u git://github.com/populist/panopoly_manifest.git
repo sync
If you want to do development on a branch and have the appropriate credentials to push code, you run the following comamnd and then use git normally to pull/push/add/commit code:
repo start BRANCH_NAME PROJECT_NAME
If you want to start all of the branches on 7.x-1.x, run this:
repo start 7.x-1.x --all
There is a lot of documentation online about Repo, but two of the best places to look are here: