first set of changes for HW7, to align with current
https://raw.github.com/startup-class/setup/master/setup.sh

- add apt-get upgrade, as that does what i thought update did
- add install of curl, though it's usually there by default
- change git-core to git
- change emacs24 to emacs-nox (no X), though little point in general
- install colordiff (cdiff) for me, and its config file
add config of my remotes to bitstarter; add postgresql and some git clone steps for HW7