support for writing X509 requests in DER format#1

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afcady wants to merge 8 commits intophotm5:rsa-derfrom

Commits on Apr 10, 2015

- add a DER reader for X509
newsham
committed

Commits on Apr 11, 2015

add a DER writer for X509
newsham
committed

Commits on Jan 23, 2016

support for writing X509 requests in DER format
Andrew Cady
committed
Add support for setting X509v3 extensions on CSRs
Andrew Cady
committed

Commits on Jan 25, 2016

Merge https://github.com/newsham/HsOpenSSL into rsa-der
Andrew Cady
committed

Commits on Jan 26, 2016

write/read DER to/from lazy ByteString instead of String
Andrew Cady
committed

Commits on Mar 2, 2017

add stack.yaml
Andrew Cady
committed
update to stackage lts-8.3
Andrew Cady
committed