Use our "avr" cookbook to simplify maintenance

* Switch to "avr" cookbook "git@github.com:h5b/chef-avr.git"
* Use opscode cookbook to install "vim" and git in the veins
  of cookbook "apt" which decouples non-related package
  installation
* Adapt Vagrantfile to enforce new run_list

 .gitmodules                           |  9 +++++++++
 Vagrantfile                           |  3 +++
 chef/cookbooks/avr                    |  1 +
 chef/cookbooks/avr/recipes/default.rb | 30 ------------------------------
 chef/cookbooks/git                    |  1 +
 chef/cookbooks/vim                    |  1 +
 6 files changed, 15 insertions(+), 30 deletions(-)