Redesign release

Has all the new design, new features and way improved usage.

Major new release with namespace support and many customizations

Thanks to the incredible @luksa and his awesome contributions in #3 we now have a super cool new version of rback:

• The access rules are displayed in a much more human-friendly format now.
• You can turn off rendering of access rules.
• You can specify one or more namespaces with -n ns1,ns2.
• Ignored prefixes are configurable, and still default to system:.
• You can make one specific kind of resource the main point of the graph. For example: rback rolebinding will render role bindings and only the subjects and (cluster)roles referenced by those role bindings.
• You can specify one or more resource names. Only the specified resource is shown plus all directly related resources.
• Rendering improvements:
  • The bindings are shown as nodes instead of edges.
  • If a role binding references a non-existent resource, the resource is clearly marked as missing.
  • Cluster roles and bindings are drawn differently than namespaced roles/bindings.
  • If a (namespaced) role binding references a cluster role, the cluster role is drawn inside the namespace, but with a dashed outline, so it's clear it is not part of the namespace (but that its access rules apply inside the namespace).
  • Groups and users are also displayed, an not just service accounts.

Detailed usage docs are coming up, soonish.

Fixes edge cases, clean up

Essentially the same functionality as v0.1.0 but addressing #1 now. Kudos to @rikatz for the fix.

Initial release

Generates cluster-wide and namespaced visualization, assumes cluster admin rights.