Added Attribute Routing and Music Controller

16) Switched to Attribute Routing, added /demo/ to URL paths
(this allows separation of cookies between front-end and WebAPI)
Add MapMvcAttributeRoutes in RouteConfig.cs
17) Added routing rules to Home controller
18) Added Root Hit Redirect rule in web.config
19) Added RehearsalListItem under new folder ViewModels
20) Added Music controller and code in Index method to show list of
rehearsals from server side
21) Added menu entry in _TopNav
--Commit to GitHub