Kas

- Support Mercurial repos
- Support Gentoo distro

- Environment variable passthrough
- Support major distro variants
- Add initial support for multiconfig

- Multi-target support
- Avoid downloading same repo twice

- Increase config file version

- Remove dynamic configuration support (Python config files)
- Shell command prepares complete bitbake configuration
- Add to define task in config and environment
- Improved error handling and reporting

- Allow in-tree repos not to be in a git repo
- Pass through git proxy related environment variables
- Write deterministic local.conf and bblayers.con
- Make configuration file versioning independent of project version
- Cleanups for uploading project to PyPI
- Print proper error message for config file format exception