Added URLS that maintain comments against a tune

We now support the routes:

GET     /genre/:genre/tune/:tune/comments
POST    /genre/:genre/tune/:tune/comments
POST    /genre/:genre/tune/:tune/comments/try
GET     /genre/:genre/tune/:tune/comment/:id
POST    /genre/:genre/tune/:tune/comment/:id

also added a help URL:

GET     /help

also, take advantage of the new user registration in MusicRest with:

GET     /newuser/register/:uuid