Fix for older fabric not having warn_only function in fabric.api module.
Deployer: Add more variants of deploy.sh. deploy_bourne attempts to set up dependencies using just sh compatible functionality (eliminate bash requirement). deploy_no_deps.sh expects to be called from deploy diretory and sets up no requirements. Galaxy team had problems with bash requirement - deploy_bourne.sh attempts to fix this. Had some complaints about virtualenv_burrito not working behind a proxy - the deploy_no_deps.sh should fix that (or at least allow a fix).
Merge @jmchilton's old vm-launcher into cloudbio.deploy. Eliminate need for git based dependency in requirements.txt for deployer. Centralize code making it easier to hack on.