Flat anonymous struct field

[micln]

What this PR does:

• flat anonymons fields
• ignore field with tag hessian:"-"

#153

Special notes for your reviewer:

when find a anonymous field in scanning struct's fields, encoding/json will flat field immediately. but I put the field to queue and flat latter

Does this PR introduce a user-facing change?:

result of encode(object) has changed,
but the method decode is compatibility with previous version

[micln]

need merge #150 first

[wongoo]

I will review this PR after #150 being merged.

[fangyincheng]

Pls resolve conflicts @micln

[micln]

should we support embed pointer like

type Dog struct{
    *Aninal
}

The super class in java will not be null, so the protocal don't need handle it. That means we can't marshal the ptr to a nil (and new a instance to hold feilds).

So I think we don't need to support the embed pointer today.

[micln]

@fangyincheng @wanghbxxxx @aliiohs pls review this agian, thanks

[wongoo]

should we support embed pointer like

type Dog struct{
    *Aninal
}

The super class in java will not be null, so the protocal don't need handle it. That means we can't marshal the ptr to a nil (and new a instance to hold feilds).

So I think we don't need to support the embed pointer today.

agree

[wongoo]

LGTM

[fangyincheng]

LGTM

[AlexStocks]

@micln pls update the readme. add some explanation about java&go inheritance, and the anonymous struct field.

[aliiohs]

LGTM

[wongoo]

@micln pls push a new PR if need update readme or demo