[geary] (26 commits) ...Merge branch 'mjog/imap-connection-fixes' into 'mainline'

[Michael Gratton <mjog src gnome org>]

Summary of changes:

  6d22950... Add a simple mock server for testing network code (*)
  95c1916... Add unit test for Geary.Imap.ClientConnection (*)
  339d8ae... Add unit test for Geary.Imap.ClientSession (*)
  d2724e1... Remove last vestiges of TCP graceful disconnect from IMAP c (*)
  cc5efc5... Minor doc comment update (*)
  7e77133... Update Geary.Imap.Command API (*)
  62f1df1... Rework Geary.Imap.ClientConnection signal and error handlin (*)
  67e9a4c... Update Geary.Imap.Deserializer (*)
  e0b973b... Update Geary.Imap.Deserialiser implementation (*)
  79ba094... Fix Geary.Imap.Command never receiving a response timeout (*)
  cd924e5... Clean up Geary.Imap.ClientSession disconnect handling (*)
  57a1ef3... Fix Geary.Imap.ClientSession::disconnect_async not working (*)
  ca7cc04... Remove Geary.Imap.ClientSession lifecyle signals (*)
  5415600... Add TestCase.assert_double (*)
  13d43d4... Update Geary.Imap.ClientSession connect timeout handling (*)
  53ce727... Minor fixes (*)
  b46838f... Update Geary.Imap.Capabilities handling (*)
  7ac7237... Update Geary.Imap.ClientSession namespace handling (*)
  9e01d8d... Remove Geary.Imap.ClientSession::server-data-received signa (*)
  b53d5b2... Simply Geary.Imap.ClientService selected mailbox handling (*)
  31260ab... Fix Geary.Imap.ClientService sometimes not closing sessions (*)
  7347451... Geary.Imap.Serialiser: Stop using GDataOutputStream (*)
  52a9102... Geary.Imap.Serializer: Trivial doc comment update (*)
  47945cb... Geary.Imap.ClientConnection: Simplify serisaliser buf handl (*)
  79125d1... Geary.Imap.Serializer: Remove unused id and to_string membe (*)
  297a59c... Merge branch 'mjog/imap-connection-fixes' into 'mainline'

(*) This commit already existed in another branch; no separate mail sent