Curl and libcurl 7.51.0

 Public curl releases:         159
 Command line options:         185
 curl_easy_setopt() options:   224
 Public functions in libcurl:  61
 Contributors:                 1441

This release includes the following changes:

 o

This release includes the following bugfixes:

 o mk-ca-bundle.pl: use SHA256 instead of SHA1
 o checksrc: detect strtok() use
 o errors: new alias CURLE_WEIRD_SERVER_REPLY [1]
 o http2: support > 64bit sized uploads [2]
 o openssl: fix bad memory free (regression) [3]
 o CMake: hide private library symbols [4]

This release includes the following known bugs:

 o see docs/KNOWN_BUGS (https://curl.haxx.se/docs/knownbugs.html)

This release would not have looked like this without help, code, reports and
advice from friends like these:

  Daniel Stenberg, Harold Stuart, Jakub Zakrzewski, Randy Armstrong,
  Ray Satiro, Viktor Szakáts,
  (6 contributors)

        Thanks! (and sorry if I forgot to mention someone)

References to bug reports and discussions on issues:

 [1] = https://curl.haxx.se/bug/?i=975
 [2] = https://curl.haxx.se/bug/?i=996
 [3] = https://curl.haxx.se/bug/?i=1005
 [4] = https://curl.haxx.se/bug/?i=981