Not all of the libraries included with Kickstart are git repositories

If you un-tar a fresh copy of the latest commerce kickstart you will find .git folders in the following directories:

libraries/chosen
libraries/jquery_bxslider
libraries/jquery_expander
libraries/jquery_ui_spinner
libraries/selectnav.js

When you use git to push the Commerce Kickstart files to another machine, the contents of those 5 directories do not get pushed, and thus those scripts aren't present on your remote site. In order to fix this you have to remove the .git directories from those folders and do a "git add . -A" to get them deleted from the repository, then re-push to populate those libraries.

Why must I do this?