Re-factored and bug fixes
This version break your code!
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SetBody and AddAlternative receive contentType var type instead string. Earlier the string were text/html and text/plain, now you need call mail.TextHTML or mail.TextPlain
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Code refactored for make all smtp and auth functions private. If you use it or you need a function in these files, pull a request for add it to email.go if need it.
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Added header.go and test, now you don't need download other dependencies.
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Comments updated in al files
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Updated readme and test