Git to ignore Ruby gems installed with --path=vendor

To support Berkshelf-based cookbook development.
Run "berks cookbook roa_maxx"

to scaffold the roa_maxx webapp cookbook.
Run "knife environment create roa_maxx"

to scaffold the main environment.
Note that I had to copy-paste the result from the temporary editor
session because knife wanted a server connection, but this project is a
local-mode project.
Scaffold the various role recipes
Add the users cookbook
Extend base recipe to add groups and users
Add user data bags
Compile cookbooks with "berks vendor"