Made Salt Minion version to install a variable - ideally Salt would offer a -latest.exe or something for Windows
make sure C:\tmp\ exists before downloading salt installer
Disable automatic ennoblement of hostiocache
This can cause behavior that requires re stat’ing
files to for the guest to realize they have
changed. Prevents manually dialing this option.
Updating docs to include :ip option
Update Teardown instructions explicitly. 

Explicitly define halting and destroying instructions. Leaves no room for implicit assumptions.
docker/configuration.html.md: Fix syntax for link.

docker provider:
* Invalid link (should be 'name:alias'): "db"
Don't output stdout and stderr twice when shell provisioner fails

[GH-4086]
install rpc package while installing nfs client on centos guests
avahi not needed
Improved box checksum verification performance

When adding large boxes verifying the checksum took noticably longer than expected because the Ruby GC was needlessly working overtime.
Better WinRM command failure messaging

Command failures include the stdout and stderr in the error message just like the SSH communicator.
Its now possible to specify only an error_class and have that use the correct error_key by default.
First attempt at trying to fix issue 2476

This addresses the error "chef is not part of the bundle" when the chef-client provisioner attempts to delete the node or client from the Chef Server. While this fixes the specific issue on my system, its likely that it does not account for all system configurations like RVM.

The Bundler.with_clean_env should probably be moved internally to Subprocess.execute, but that's a riskier change and I'd like to get some feedback before even attempting that size of change.
Merge pull request #4099 from mitchellh/fix-issue-2476-chef-client-node-cleanup

provisioners/chef: clean bundle env when executing chef client
provisioners/chef: put global lock around knife exec
Merge pull request #3932 from marnovdm/feature/salt-modular-version

provisioners/salt: Updates Salt Minion version in Salt Bootstrap script for Windows
update CHANGELOG
Merge pull request #3934 from xstevecs/master

providers/virtualbox: Disable automatic enablement of hostiocache
update CHANGELOG
Merge pull request #4077 from simono/patch-1

docker/configuration.html.md: Fix syntax for link.
Merge pull request #4090 from mitchellh/improve-checksum-verification-performance

core: Improved box checksum verification performance