declare and initialize set to hold currently active requests
add requests to set upon adding them, remove them in custom listener
add removing request-listener to list of listeners for request
add member for access-grant and setter to authenticated requests
update access-grant in pending requests after refresh
set initial grant for new requests
add clue-comment on how to set request-factory
add members for URI and HttpMethod to authorized requests and initialize them in constructor
add method to generate authorization-headers for authorized requests
fire the rest-template with uri and method from constructor, headers from access-grant and result-type
make loadDataFromNetwork final - subclasses should just put their URI and method into the constructor
update javadoc in authorized request
code-formatting