[WIP] Config labels

Given the below quote from https://code.google.com/p/go-wiki/wiki/CodeReviewComments#Named_Result_Parameters

> Clarity of docs is always more important than saving a line or two in your function.

I think I prefer
`func (p *TemplateProcessor) Process(template *api.Template) (*config.Config, error)`
over
`func (p *TemplateProcessor) Process(template *api.Template) (config *config.Config, err error)`
in the Godocs.

What do you think?