contributors.sh: output list RELEASE-NOTES formatted
RELEASE-NOTES: synced with 12ecd56da77
SFTP: stat remote file also when CURLOPT_NOBODY is 1

Make it possible to call
curl_easy_getinfo(curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &filesize)
and related functions on remote sftp:// files, without downloading them.

Reported-by: Yingwei Liu
Bug: http://curl.haxx.se/mail/lib-2014-01/0139.html
axtls: fix compiler warning on conversion ssize_t => int
RELEASE-NOTES: added missing bug ref
RELEASE-NOTES: added another missing bug ref
test1514: Got rid of a non-const initializer C99ism