Do some forward porting of the old work of
mitchellh/packer's docker branch. #774
Rename docker post processor to docker-push.

Implement login to a docker registry, error handling
Finish up parameter parsing and validation.

Login to a docker index now works, ready for
implementation of the actual push logic.
Add docker-import post-processor.

Implemented initial working version
of Docker image importing code. #774
website: update defaults for DO ID's
Start adding dockerfile provisioning to docker-import post-processor #774
docker-import post-processor, add TODO #774
docker-import: finish up Dockerfile provisioning, Add TODO for next section #774
HTTPDownloader uses UserAgent from DownloadConfig
StepDownload uses packer version as user agent
Fixes #806 Build fails if GOPATH has multiple paths
Add more special scancodes
Fix tabs vs spaces
Update virtualbox-iso.html.markdown

Changed type to virtualbox-iso
docker-import + docker-push: Add some beginning tests.  #774
docker-push: add code to handle seperate registry, push a specific repository/tag #774
Update post-processor.html.markdown

Fixed some typos in the interface{} mentions.
Updating the googlecompute builder documentation.
scripts: Fix slight bash error
scripts: devcompile works properly in Cygwin