improving AsyncHttpRequester test's resiliance against timing issues.

It will now finish as soon as all requests have been executed, but at most 1 second.
Merge branch 'master' of https://github.com/tasubo/jgmp
adding necessary parameter "cd" (content description) to AppView.

Hit is not recorded if this parameter is missing for an app view. Website hits
don't need the parameter since the value is derived dh and dp (see https://developers.google.com/analytics/devguides/collection/protocol/v1/parameters#cd)
Merge pull request #9 from mkischel/issues/8

Issues/8