Merge pull request #302 from LeeroyDing/https

Added https support
minimal verification code support
sometimes server returns ({"rtcode":-1,"list":[]}), add retry
encode file path safely
Merge branch 'master' of github.com:iambus/xunlei-lixian
fix verification code capitalization
ignore BOM
update README with thanks to synology
increase .torrent file size to 2M
set retry log level to debug
increase retry count to 10
Merge from iambus master