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adjust code to Nocrypto API change
 no distinction between hash and mac
Merge pull request #194 from mirleft/hash-mac-nocrypto

adjust code to Nocrypto API change
explicit match NULL here, not a catch-all
Merge pull request #195 from mirleft/minor

explicit match NULL here, not a catch-all
include the FLOW interface
fix example
we need mirage-dev here atm
lets use opam1.2
opam1.2 fixes
Merge pull request #196 from mirleft/mirage-fixes

mergggge!
x += 17 - 17
Merge pull request #197 from mirleft/mergggge

x += 17 - 17
describe approach of SNI
adjust interface of configuration
adjust implementation and checks of configuration
first select certificate (depending on SNI from client), then ciphersuite
fix compilation of lwt and examples
provide a polymorphic variant for own certificates
cleanup after type change in config.own_certificates