Support to mark requests as starred.

[ranjan-rk]

1. Following API can be used to fetch starred nodes: http://localhost:8080/api/nodes/starred
2. Here is how to mark a node as starred : http://localhost:8080/api/nodes/10
   {"id":10,"starred" : true}

[ranjan-rk]

[nikhil-p]

@ranjan-rk : I would like to work on this issue. Could you please assign this to me.

[ranjan-rk]

Assigned to @nikhil-p
Let me know if you need any help.