~singpolyma/dhall-ruby

Add build instructions to README
Add grab-bag of useful utils onto expressions
Add experimental json/yaml to dhall scripts
nil hash values are omitted from record
Add as_dhall refinement
Test typechecker edge cases
Optional#value is not what we want here
Update makefile with more helpers
Run all dhal-lang typecheck tests
Run all dhall-last tests for cache_key
Run all dhall-lang tests for normalization
Allow self-describing CBOR
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