Validate Roles

[pritidesai]

With this PR #262 we have defined roles as Developers, Contributors, and Operators.

Operators: users who deploy, configure, and host the Apache OpenWhisk Function-as-a-Service platform for development, testing and/or production.

Developers: end users developing functions/actions, creating packages, feeds, and feed provider services using project APIs, clients and tooling.

Contributors: developers designing and developing backend architectural components and tooling that comprise the OpenWhisk platform and its project ecosystem.

Please validate these three roles and see if we need to redefine these roles to something like:

https://github.com/knative/docs/blob/master/images/knative-audience.svg

Or

Rename Developers with Users based on Apache standards.

[rabbah]

We should further disambiguate users and developers.