Add Deletion

Add support of the DELETE HTTP request and call the Phobos function phobos_delete

* Add new class DeleteRequestHandler and add it to the Factory
* Add phobos_delete_cpp to the Phobos wrapper, which calls phobos_delete
* Add a delete_object function to Stream/Fifo and Storage/Phobos
* Add tests to delete objects
5 jobs for add_deletion in 18 minutes and 39 seconds (queued for 3 seconds)