typo
clarify documentation of docker.link()
providers/docker: fix support of agent forwarding
Update CHANGELOG: fix docker agent forwarding

Ref GH-4905
provisioners/ansible: use Docker proxy when needed

Close #4071

Credits and best thanks to @jabclab
Read the ATLAS_TOKEN in vagrant-login
Update Atlas Push to use new vagrant-login API
Use the new Rails error format
docs: link to the atlas box search page instead of homepage
Merge pull request #4934 from mitchellh/sethvargo/login_token

Read ATLAS_TOKEN in vagrant-login
Fix failing test
Cleanup generated Vagrantfile
Remove editor comments from min Vagrantfile
Add push example
Merge pull request #4946 from mitchellh/sethvargo/vagrantfile

Cleanup Vagrantfile
Merge pull request #4937 from mitchellh/sethvargo/error_format

Use the new Rails error format
added chec_zero page to be shown in sidebar
Merge pull request #4947 from joelhandwell/master

added chec_zero.html page to be shown in sidebar
Merge pull request #4906 from mitchellh/gc-4071-docker-ansible

provisioners/ansible: use Docker proxy when needed
Merge pull request #4905 from mitchellh/gc-fix-docker-agent-forwarding

providers/docker: fix support of agent forwarding