drop special gem installation steps
Fixes #13455 - Recommend genisoimage for -libvirt
Bump changelog to 1.15.0 to match VERSION
Sync 1.13.x releases into changelogs
Remove extras/rdoc from foreman
execute build tasks only once
foreman-installer needs kafo >= 1.0.5
fixes #17406 - use nodejs >= 4.2
use ruby2.0 for foreman-proxy on trusty
fixes #15834 - set BUNDLER_CMD in foreman-rake
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