v0.22.0

Release notes

• Automatic fetching of PGP keys from standard HKP key servers (e.g. pgp.mit.edu) in case whiteout key
  server has no key
• Automatic upload of PGP key to standard HKP key servers after email validation in whiteout key server
• Display more info in contacts: first name, last name, key source
• Autocomplete in writer can now filter first name, last name and email address
• Loosen file ending restriction for PGP file import (don't allow just *.asc)
• Remove multiplexing for socket.io ... each tcp-socket will get it's
  own connection.
• Improve readability of grey on grey text in desktop mail-list
• More descriptive error message for wmail signup
• Hide unread count next to sent folder
• Fix fetching of mail bodies after coming back from read mode
• Fetch new oauth token from chrome.identity api for each new smtp/imap
  connection separately