Re-run composer install and commit results

For some reason the unit tests keep failing on Jenkins because
a class cannot be found in the JoindIn API Client. Because I was
without internet when I started development on this item I have
manually injected the API Client during that time.

To make sure everything is in working order I re-ran composer
install with an empty vendors folder and noticed that the
installed.json missed information.

In order to make sure everything works as expected I committed
all changed artifacts by Composer.