Rename methods to more appropriate names
Add Rhn#available_channels with spec
Add Rhn#disable_channel with spec
Add Rhn#all_repos and spec
Add SubscriptionManager#enable_repo and spec
Add SubscriptionManager#disable_repo and spec
Add SubscriptionManager#all_repos and spec
Add Rhn#enabled_repos
Add SubscriptionManager#enabled_repos
Merge pull request #88 from brandondunne/enable_disable_and_list_rhn_and_subscription_manager_repos

Enable, Disable, and List Rhn and SubscriptionManager repos