added support for nodemon. 

supports cs and json file changes. Add the following statement to the project.json file under the commands node.
`"kestrelmon":  "Microsoft.AspNet.Hosting --server Kestrel --server.urls http://localhost:5004"`

`"commands": {
        "web": "Microsoft.AspNet.Hosting --server Microsoft.AspNet.Server.WebListener --server.urls http://localhost:5001",
        "kestrel": "Microsoft.AspNet.Hosting --server Kestrel --server.urls http://localhost:5004",
        "kestrelmon":  "Microsoft.AspNet.Hosting --server Kestrel --server.urls http://localhost:5004"
    },`
@johnpapa kestrelmon is kmon kept the kestrel reference to not confuse intend to add win support as well which does not use kestrel as host