Make download of install.sh work without curl or wget (using python)

Proposed workaround for #39.
This solution to #39 takes another approach: Rather than installing curl with "apt-get" or a pre-install command, we are adding next to curl and wget a download using python interpreter. We could also do it with perl, this way we will cover I think most of distributions.

Just to note, I encountered the "curl or wget is missing in the box" issue with boxes at http://cloud-images.ubuntu.com/vagrant/raring/ , that are kind of ubuntu "official" images.

Also, this workaround will probably then call https://www.opscode.com/chef/install.sh , which also only works with curl and wget. If we are ok with this python solution, we will need to propagate this changes to the install.sh.