allows for named structs to be included in reflection

[qhenkart]

type Sample struct {...}

type EmbedSample struct {
	Sample
}

I see no reason why an embedded struct is supported but a named struct is ignored. I've updated the code so that

type EmbedSample struct {
	Named Sample
}

will be included when encoding a csv

[graywolf336]

@qhenkart and @pikanezi can we revert a portion of this or add some functionality back? With this change ignoring structs is no longer possible. See #107

[qhenkart]

^^ this PR did not cause the issue. It only included named struct values into the CSV value. The struct gray wolf is using happens to only contain named values, but if it contained anonymous values, it will function the same even with this PR.

The functionality that gray wolf is protesting is defined as working correctly judging from this test https://github.com/gocarina/gocsv/blob/master/encode_test.go#L268

I have included a new PR that resolves the user issue, however I believe it to be a breaking change #152

for the record, I agree with gray wolf that a csv:"-" should have its children ignored as well