Grocker

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- Use env vars to pass pip constraint file to wheel compiler.
- Fix empty config file bug

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- Add ``--image-base-name`` option to allow customizing the generated image name

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- Fix grocker for releases with extras.
- Make sure most tests run without ``--docker-image-prefix`` hence without cache.

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- **Warning** - This version is broken for extras, use 4.3.2 instead.
- Fix ``compiler-image/provision.sh`` sh syntax. ``source`` replaced by ``.``

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- **Warning** - This version is broken, use 4.3.2 instead.
- Correctly parse the release string and store extras as label and environment variable
- Use the image defined in the configuration (it still needs to be debian based - for the moment)
- Provision scripts now only require sh (instead of bash previously)
- Correctly parse OSX docker client output

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- Add a sync after chmod call to avoid an AUFS issue
- Fix image search when repoTags is None and not an empty list
- Use env vars to expose grocker meta-data to the application
- Expose some meta-data using image labels
- Use docker build args to pass some build parameters
- Add application venv bin in PATH