merge libravatar support into master

diff --cc Debbugs/CGI/Bugreport.pm
index 707c3a0d68a315d6e7791b265a04312be1b16522,59d88b07f5dedbdcb112574881a2085f084405be..29602c58c39f1088bc17208e49ab28c1561ac152
--- 1/Debbugs/CGI/Bugreport.pm
--- 2/Debbugs/CGI/Bugreport.pm
+++ b/Debbugs/CGI/Bugreport.pm
@@@ -32,10 -32,11 +32,12 @@@ use base qw(Exporter)
  
  use IO::Scalar;
  use Params::Validate qw(validate_with :types);
 -use Debbugs::MIME qw(convert_to_utf8 decode_rfc1522 create_mime_message);
+ use Digest::MD5 qw(md5_hex);
+ use Debbugs::Mail qw(get_addresses);
 +use Debbugs::MIME qw(decode_rfc1522 create_mime_message);
  use Debbugs::CGI qw(:url :html :util);
  use Debbugs::Common qw(globify_scalar english_join);
 +use Debbugs::UTF8;
  use Debbugs::Config qw(:config);
  use POSIX qw(strftime);
  use Encode qw(decode_utf8);