Add Gemfile.lock and pkg to gitignore

Trying to get cleaner check-ins.
Making a chef-solo directory

Wanting to get pieces into clearly defined places in this repo. The
chef-solo stuff has a new home.
Refactor this repo for Vagrant and Heat builds

We need both Heat and Vagrant builds to work. So, we will extract all
build tasks to .omnibus_builder.sh and have each of the instance
provisioning tools (Vagrant and Heat...possibly others later) stand up
the instance and then run that script.
Add .omnibus to .gitignore

Dont want to check that in.