Implement alerts API

implemented 4 new api methods from "Related to Pull Queues" block

    /projects/{Project ID}/queues/{Queue Name}/alerts POST
    /projects/{Project ID}/queues/{Queue Name}/alerts PUT
    /projects/{Project ID}/queues/{Queue Name}/alerts DELETE
    /projects/{Project ID}/queues/{Queue Name}/alerts/{Alert ID} DELETE

also updated:

    /projects/{Project ID}/queues/{Queue Name} GET