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

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pmrukot wants to merge 4 commits intomasterfrom

Commits on Jan 30, 2018

chore: Upgrade roc-repo version, add jest and update roc.config.js
Patryk Mrukot
committed
feat(roc-package-web-app): Upgrade package to use Koa@2
Patryk Mrukot
committed

Commits on Jan 31, 2018

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

Commits on Feb 1, 2018

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