enable insecure content in chromium runner for now

Allow chromium to access insecure content. This is required for now as not all
external services expose secured endpoints.

This should not cause a problem in practice, but is still bad. We should ensure
that this will not be needed in the future.

See issue #22.

config.json

@@ -9,6 +9,8 @@
         "chromeOptions": {
           "args" : [
             "--disable-web-security",
+						"--user-data-dir=$HOME/tmp/chromium",
+						"--allow-running-insecure-content",
             "--use-fake-device-for-media-stream",
             "--use-fake-ui-for-media-stream"
           ]