fixes #2808 - pin nokogiri to 1.5.x for Ruby 1.8
fixes #2373 - only reference unattended subnet path when in unattended mode
fixes #2684 - add foreman-rake script to /usr/sbin
fixes #2814 - fixing foreman-debug warning message
fixes #2812 - method lookup_values_attributes= not defined in Host::Managed (NameError)
fixes #2818 - validation of OS families in ptables