Added babel transpiler of core library down to es2015 syntax.#715

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ragnarstolsmark wants to merge 3 commits intogitana:masterfrom

IdentityStream:bugfix/transpiler

Commits on Jun 19, 2019

Added babel transpiler of core library down to es2015 syntax. This fixes a bug caused by Alpaca-async.js using spread syntax which is not supported in IE11.
Ragnar Stølsmark
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Commits on Jun 21, 2019

Changed from babel/preset-es2015 to preset-env
Ragnar Stølsmark
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Only transpile Alpaca-async.js.
Ragnar Stølsmark
committed