Promisify relation/scope methods in juggler

[sundeepgupta]

If I define a model with a custom scope like this:

 "scopes": {
 "active": {
 "where": {
 "status": "active"
 }
 }
 }

When I call it from client code MyModel.active(), this does not return a promise, it requires a callback argument.

[jannyHou]

@sundeepgupta the scope functions are not promisified yet. I will label this issue as a feature to keep track of the status of Promisify relation/scope methods in juggler. Thanks for bringing it up.
And here is a placeholder shows what apis we already promisified: #418

[sundeepgupta]

thanks @jannyHou