Add NetBSD guest support
More specific Solaris <11 detection.

Note: This will probably break on Solaris 12+, but not certain of a better approach for now.
More specific Solaris 11 detection
providers/virtualbox: retry list hostonlyifs [GH-2831]
Merge pull request #2824 from masteinhauser/patch-1

guests/solaris: More specific Solaris <11 detection.
Update CHANGELOG
core: update translation to help Windows more
synced_folders/nfs: don't nfs_prune on hosts that don't support it
synced_folders/rsync: convert path to cygpath on Windows
core: dont' load rc or profile when getting a cygpath with bash
synced_folders/rsync: make sure host path ends in "/"
core: get tests passing on Windows, more tweaks
Update dep to Bundler 1.5.2
website/docs: clarify rsync i nstallation for Windows
synced_folders/rsync: output directory under watch for rsync-auto
Install Bundler 1.5.2 for tests
providers/virtualbox: validate missing keys [GH-2831]
commands/init: update template to use strings, not symbols
provisoiners/docker: only add user to group if not in it [GH-2838]
Merge pull request #2819 from stoned/guest-netbsd

Add NetBSD guest support