Change directory structure generated by 'init' to support envs

This commit will remove the vendor/lib and vendor/schema directories
generated by 'init'. An 'environments' directory will be created from
the root app directory, with the default environment directory 'dev'
and it's containing contents rooted at 'environments'.

The intention of environments are to represent the deployment
environments of Kubernete clusters, with the following example
directory structure:

app-name/
  ..
  envs/
    dev/
    us-west/
      prod/
      staging/