fixes #246 - add kickstart compatibility with RHE6 and minor fixes for ftp based urls

fixes #237 - installing puppet from epel breaks if base image is not 5.3 or 4.9 release

fixes #235 - Small refactoring of the media handling for operating system families: * Use URI class for any URI related operations * Added substitution for $version, $major and $minor in media path * Force use of http(s)|ftp|nfs URI schema: NFS shares have now to be entered in URI form: nfs://server/path/.../ instead of server:/path/.../

Fixes #177 - Family concept

It will_paginate and handle searches
Added family support to Operatingsystem
More work will be needed to add family support to host manipulation.