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Add DSL to Required (#21)

The new DSL makes it easier to use required as you can now write
cleaner expressions, which map directly to Required and R objects.

The DSL has the following features:

* Supports string and float/int literals
* Supports nested expressions
* Supports arithmetic on R objects
* Supports calling whitelisted functions/callables

The validate decorator has been extended to extract validation rules
from the function docstring making it easier to write rules in place.

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