dovecot updated to 2.2.19

- mdbox: Rebuilding could have caused message's reference count to
  overflow the 16bit number in some situations, causing problems when
  trying to expunge the duplicates.
- Various search fixes (fts, solr, tika, lib-charset, indexer)
- Various virtual plugin fixes
- Various fixes and optimizations to dsync, imapc and pop3-migration
- imap: Various RFC compliancy and crash fixes to NOTIFY
- pigeonhole updated to 0.4.9
- ManageSieve: Fixed an assert failure occurring when a client
  disconnects during the GETSCRIPT command.
- doveadm sieve plugin: Fixed incorrect initialization (mem leaks) of mail user.
- sieve-filter command line tool: Fixed handling of failure-related
  implicit keep when there is an explicit default destination folder.
- lib-sieve: Fixed bug in RFC5322 header folding.

.gitignore

@@ -90,3 +90,5 @@ pigeonhole-snap0592366457df.tar.bz2
 /dovecot-2.2.18.tar.gz
 /dovecot-2.2-pigeonhole-0.4.7.tar.gz
 /dovecot-2.2-pigeonhole-0.4.8.tar.gz
+/dovecot-2.2.19.tar.gz
+/dovecot-2.2-pigeonhole-0.4.9.tar.gz