provisioners/all: report proper invalid keys [GH-2117]
Merge pull request #1537 from wormzer/master

communicator/ssh: Additional proxy_command option
Update CHANGELOG
core: exec with the proxy command if specified
provisioners/chef: chown/create folder before access [GH-2121]
v1.3.0

This will actually be released tomorrow, most likely, but I want
to get the installers all ready.
Up version for development
Vagrant docs: added most awaited keys for VMX customisation
core: dup the synced folder options [GH-2134]
core: dup option hashes everywhere
Merge pull request #2127 from herdani/patch-1

website/docs: added most awaited keys for VMX customisation
website/docs: update vmx wordings
core: VAGRANT_VAGRANTFILE affects only project vagrantfile [GH-2130]
provisioners/chef: work with restrictive umask [GH-2121]
provisioners/puppet: sudo test for folders for umask
provisioners/chef: env config less restrictive
provisioners/chef: fix syntax error
core: don't use active_machines too much, deletes data
fix failing test
core: handle EACCES when cleaning up .vagrant dir