Fixes #19
Improve connection tests
Merge branch 'master' of https://github.com/andreyknupp/SMTPClient
More tests (Composer, HeaderWrapper)
Fixes #15
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Fixes leading whitespace Message::getMessage()
Improve HeaderWrapper::wrapStructured()
Adding HeaderSet and QuotedPrintable tests.
Fix QuotedPrintable tests
Fix QuotedPrintable tests (2)