Adds templates to widget properties.
Merge branch 'master' of github.com:mikl/zopf-stub-server

* 'master' of github.com:mikl/zopf-stub-server:
  No need to hardcode domain name.
Merge branch 'master' of github.com:mikl/zopf-stub-server

* 'master' of github.com:mikl/zopf-stub-server:
  new widget courselist
Uses external template for course list.
Fixes Content-Type which is actually sent from the test server.