Pulls all the repos in a directory in a multi-threaded way to save you time!
cd to the directory of your choice, all git repos you want to update should be subdirectories of this.
Run the script.
From your current working directory, it will perform a breadth first search to find directories that contain .git
In a subprocess it will peform the following:
cd {absolute_path}
git pull
git submodule update --init