fix for duplicate usage of "id"

[TerraSkye]

only uses current class to check for methods instead of all its parents.

[coveralls]

Coverage remained the same at 93.493% when pulling 1e89fce on TerraSkye:patch-1 into 848f9c3 on webonyx:master.

[vladar]

Thanks for the suggested fix. But I think the better solution would be to just prefix resolvers method names with resolve (so that full method name became "resolve" . ucfirst($fieldName)). This is example after all, so I'd like to keep it clear for end-users what's going on.

If you agree to change the fix - I'd greatly appreciate your help!

[TerraSkye]

I also saw that its not the only point the problem occurs. So it needs a bit more wurk

[vladar]

I fixed it in f668300