Optimize encoding performance in Erlang#150

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gasparch wants to merge 3 commits intodavisp:masterfrom

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Commits on Jun 29, 2017

Allow encoding of int as map key to avoid forcing convertion to binary in Erlang
Gaspar Chilingarov
committed
fix tests
Gaspar Chilingarov
committed

Commits on Nov 11, 2017

Fix code style and documentation.
Gaspar Chilingarov
committed