Upgrade roc-package-web-app to use Koa@2#30

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pmrukot wants to merge 4 commits intomasterfrom koa-upgrade

+419-33

Commits on Jan 30, 2018

Commits on Jan 31, 2018

test(roc-package-web-app): Add tests to createServer
pmrukot
committed

Commits on Feb 1, 2018

test(roc-package-web-app): Fix linting
pmrukot
committed