Build core and calev modules for Scala.js

[fthomas]

No description provided.

[codecov]

Codecov Report

Merging #415 (e2afda0) into master (8330757) will not change coverage.
The diff coverage is 100.00%.

❗ Current head e2afda0 differs from pull request most recent head dfa942f. Consider uploading reports for the commit dfa942f to get more accurate results

@@           Coverage Diff           @@
##           master     #415   +/-   ##
=======================================
  Coverage   74.19%   74.19%           
=======================================
  Files           5        5           
  Lines          31       31           
  Branches        3        3           
=======================================
  Hits           23       23           
  Misses          8        8           

Impacted Files	Coverage Δ
...la/eu/timepit/fs2cron/ZonedDateTimeScheduler.scala	100.00% <100.00%> (ø)

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