Extends hoodie with an admin module with commont tasks needed for the pocket admin UI.
remove trailing slash(es)
init admin submodules
proxies to hoodie.trigger with admin prefix
proxies to hoodie.on with admin prefix
just like the standard hoodie.request method,
but with an admin. subdomain on hoodie.baseUrl,
so that interaction with hoodie.admin does not
interfere with other hoodie.requests.
same as hoodie.open, but as admin
HoodieAdmin