fix: export systemjs module for browser (#26)

Author: patrickmichalina

circle.yml

@@ -47,6 +47,9 @@ jobs:
         - run:
             name: Build
             command: npm run build
+        - run:
+            name: Build.System
+            command: npm run build.system
         - run:
             name: Semantic Release
             command: node_modules/.bin/semantic-release