Lazy sequence operations

[lilactown]

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[borkdude]

@lilactown Looks awesome!

I committed some improvements to prn here that make it behave like this:

 $ ./node_cli.js -e '(prn (take 2 (repeat :foo)))'
["foo","foo"]

[borkdude]

@lilactown I moved the base branch of this PR to my updated branch pushed in this repo.

[borkdude]

Also made range lazy now.

[borkdude]

Fixed test