Various fixes#9

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dlee wants to merge 4 commits intojruby:masterfrom

Commits on Aug 10, 2011

Implement PKCS7#type=
David Lee
committed
Workaround strange case of split OctetStrings
David Lee
committed
Support degenerate certs-only PKCS7
David Lee
committed
CertificationRequestInfo attribute can be a Sequence
David Lee
committed