Merge pull request #247 from clinty/master

Add DAV, hOpenPGP, MusicBrainz
Only use streaming show-details for cabal 1.20
Patches for #236 and close
Fixes for MusicBrainz and nettle

Pinging @clinty
Add Silk packages
Skip some tests
Reenable rest tests silkapp/rest#40
Add hybrid-vectors
snapframework -> mightybyte
Add openpgp-asciiarmor