Type constructor order

[qnighy]

As far as I know, there are three common syntaxes for type constructors and one:

• map(k, v): C++, Reason, Rust etc.
• map k v: Haskell, OCaml (revised syntax), Coq etc.
• (k, v) map: OCaml (normal syntax), SML, etc.
• k v map: SATySFi

I suggest changing the syntax to Haskell-like one, which is uniform to SATySFi's expressions.

[qnighy]

I'm closing this issue for now. See #50 for discussion.