Closes #375

Closes #374

closes #371

Bug: http://curl.haxx.se/mail/lib-2015-08/0019.html
Reported-by: Inca R

closes #366

Closes #361

Closes #360

Bug: http://curl.haxx.se/mail/lib-2015-07/0149.html
Reported-by: Eric Ridge

Bug: http://curl.haxx.se/mail/lib-2015-07/0149.html
Reported-by: Eric Ridge

...as well as some rewording.

and made the indent level to 1

... and some general rewordings to improve this docs.

Reported-by: Tim Stack

Closes #356

.. also update formatting and add WinSSL and wolfSSL to the SSL/TLS
handlers list.

This is a new document to consolidate our thread safety information from
several documents (curl-www:features, libcurl.3, libcurl-tutorial.3).
Each document's section on multi-threading will now point to this one.

Closes #322 for now

Closes #349 for now

New tool option --ssl-no-revoke.
New value CURLSSLOPT_NO_REVOKE for CURLOPT_SSL_OPTIONS.

Currently this option applies only to WinSSL where we have automatic
certificate revocation checking by default. According to the
ssl-compared chart there are other backends that have automatic checking
(NSS, wolfSSL and DarwinSSL) so we could possibly accommodate them at
some later point.

Bug: https://github.com/bagder/curl/issues/264


Reported-by: zenden2k <zenden2k@gmail.com>

Prior to this change test 1119 failed due to the missing symbols.

Just to underscore how we treat each other in this project. Nothing new
really, but could be useful for newcomers and outsiders to see our
values.

Reported-by: bemoody
Bug: https://github.com/bagder/curl/issues/325