support for composition objects with pointers.

[rubensayshi]

Describe the PR
this pull request adds support for embedded structs / composition with pointers.

type Foo struct {
	Field1 string
}
type Bar struct {
	Field2 string
}

// this was working
type FooBarWorking struct {
	Foo
	Bar
}

// this was not working
type FooBarNotWorking struct {
	*Foo
	*Bar
}

[rubensayshi]

I don't understand why the go1.8 build is failing on travis ... it seems to fail on make deps o.O?

[asdptkt]

Welp, and I need this too.

[rubensayshi]

tests fail because go 1.8, see; #228

[easonlin404]

LGTM

[easonlin404]

@rubensayshi Thanks for your contributions. 🎉