Remove the content option.

The value of content is populated based on the file parameter which is used
Ping was not working because it was not inheriting from the foreman commands.

Created a new ReadCommand for Katello which inherits from the foreman command.
Subclassed ping command from the new ReadCommand
Merge pull request #61 from bbuckingham/content-views

Content views - merge in master
Content Views: initial support for filter rules
Merge pull request #35 from bkearney/bkearney/hide-option-in-subscription

Remove the content option.
Merge pull request #57 from bkearney/bkearney/get-ping-to-work

Ping was not working because it was not inheriting from the foreman comm...
Merge pull request #62 from bbuckingham/content-views-filters

Content Views: initial support for filter rules
CI: Migrating to Travis
Merge pull request #66 from daviddavis/temp/20140220104848

CI: Migrating to Travis
Merge branch 'master' into cv-merge-master-again
here's a boilerplate set of commands for a katello object
Merge pull request #46 from komidore64/boilerplate

here's a boilerplate set of commands for a katello object
repository sets - list, enable, and disable commands
Merge pull request #70 from daviddavis/cv-merge-master-again

Merging in master to content views
Merge pull request #63 from komidore64/repo-sets

repository sets - list, enable, and disable commands
README: Adding better install instructions
Merge pull request #71 from daviddavis/temp/20140220121310

README: Adding more thorough install instructions
README: Remove verbage about gems being viable for development
Merge pull request #73 from daviddavis/temp/20140221075749

README: Remove verbage about gems being viable for development
Support ids and names.

The checkin shows examples with the environment commnads. You include one module and it just works(tm).
This commit also contains a new path command which requires pull request
https://github.com/Katello/katello/pull/3720 to work.