Fixes #4936 - Added repo info, update, delete ops

Hammer cli changes for repo RUD.
Fixes #4953 - Show sync plan description
Merge pull request #130 from daviddavis/temp/20140329070513

Fixes #4953 - Show sync plan description
Fixes #4798 - Subscriptions and system groups for activation keys

ak-sysgroups - subs add/remove working
ak-sysgroups - sysgroup add/remove working

ak-sysgroups - made quantity optional

ak-sysgroups - rubocop clean
Merge pull request #117 from daviddavis/ak-sysgroups

Worked on activation keys and system groups
Merge pull request #129 from parthaa/repo-crud

Fixes #4936 - Added repo info, update, delete ops