Add funtoo guest support.  Based heavily on https://github.com/mitchellh/vagrant/pull/1840
core: re-arrange some code to make things easier to read later
core: correct some doc comments
core: box add fails early if box already exists [GH-2621]
core: warn if no provider is specified that we can't check for it
core: undo last for now
providers/virtualbox: export after checking if package exists [GH-2380]
provisioners/chef-solo: delete data bag secret [GH-2712]
Merge pull request #2674 from phinze/static-nfs-guest-ips

core: problems with using VirtualBox guest properties for reading NFS Guest IP
Update CHANGELOG
v1.4.2
website/www: 1.4.2
up version for dev
Revert "Add funtoo guest support.  Based heavily on https://github.com/mitchellh/vagrant/pull/1840"

This reverts commit 3559c0808607e90237c3f86c750404b97e7a531c.
Add funtoo guest support. Based heavily on https://github.com/mitchellh/vagrant/pull/1840
:fireworks: New year! :fireworks:
Merge pull request #2734 from seginoviax/funtoo

New guest: Funtoo
Update changelog
detect fedora 19 and 20
Merge pull request #2742 from ryansb/FedoraDetection

Correctly detect fedora 19 and 20