Yay

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- This is still pre-release, no API or language stability guarantees

- Variable resolving is now done in expression tree without a seperate resolve stage

- Uses pyparsing to parse {foo[bar][.baz > 5]} type syntax

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- This is a pre-alpha release to experiment with what we can and can't do.

- New PyYAML Loader subclass for getting ordered maps without ugly !!omap markup

- Resolves {} markup within YAML nodes

- Lazily evaluates .copy, .append and .remove instructions