Tutorial: http://chrisjean.com/2009/04/20/git-submodules-adding-using-removing-and-updating/
Added:
git submodule add git://github.com/jrburke/requirejs.git support/requirejs
git submodule init
git submodule update
cd support/requirejs
git checkout 0.24.0
git submodule add git://github.com/ajaxorg/async.js.git support/asyncjs
git submodule init
git submodule update
cd support/asyncjs
git checkout d36ead408e2959b1e99572114ef3a1b6a48c1072
git submodule add git://github.com/caolan/dispatch.git support/dispatch
git submodule init
git submodule update
cd support/dispatch
git checkout b56fb4ed7a63c5556c05435ec797137fe105a1c2