Merge pull request #1303 from alex/add-d2i_PKCS7_bio

Added d2i_PKCS7_bio to bindings
Added this to the changelog
Merge pull request #1296 from reaperhulk/fix-1295

X509_VERIFY_PARAM_set_hostflags is available in 1.0.2-beta2
pyOpenSSL is a word
Merge pull request #1305 from alex/backport-pkcs7

Backport pkcs7