Download the vagrant image from: https://docs.google.com/file/d/0B3OVplM20u2gWW1aMG0wdXdySTA/edit?usp=sharing
From your downloads folder run this command:
vagrant box add kiwi package.box
From your rails repository (where you cloned the git repository) you should now be able to start the kiwi vagrant virtual machine.
vagrant up
Then ssh into your newly created environment and install your gems
# vagrant ssh
# cd /home/vagrant/projects/kiwi
# bundle install
You may need to run database migrations before you can start the server
rake db:migrate
If you want to fill your database with some seed data, also run
rake db:seed
When that is done, run
./rails_server.sh
You should now be able to access kiwi from your browser on your host machine http://localhost:3000 in Chrome.
Continue development on your host machine as though you had the rails application running on your local computer. Vagrant will take care of syncing your changes over. If you need to install a new gem or run database migrations restart the server make sure you do it from your vagrant terminal.
If you are intending to run unit tests (and why not :| ) you will need to run them from the vagrant machine. You can do this by opening up a nother temrinal window and ssh'ing to the vagrant machine and runing rake spec or what not from that terminal in your project folder. If you try and run the unit tests from your host machine you will find that they can not connect to the database.
When you are done developing make sure you shutdown the virtual machine by running:
vagrant halt
If you are no longer in need of this particular machine, or you messed up the virtual machine in some way, run vagrant destroy and vagrant up and you will be back where you started.