Moves deploy gems out of :development group for bundler.
Only forwards ssh agent session w/ local vagrant.

Agent forwarding won't work until knife-solo is patched.
See: https://github.com/matschaffer/knife-solo/issues/121#issuecomment-12636204
Moves default last-mile recipes from vagrantfile to role.
Adds directory in recipe that would normally be created as part of local shared in init rake task.