Installing foreman on Ubuntu from source

Question

I'm working locally on a NodeJS Heroku app, and I'd like to use foreman to run my app. It apparently didn't install with the Heroku toolbelt (has anyone else had this problem?).

Is there a way to re-install the Heroku toolbelt to get foreman? Or could I get foreman from git? I saw the instructions here but after getting the repo and executing:

git submodule init
git submodule update

It still says that the "foreman" command is not found. What can I do to get foreman to work?

Thanks

Edit: I'm using Ubuntu