Log Message:
Changes 7.33.0:
* test code for testing the event based API
* CURLM_ADDED_ALREADY: new error code
* test TFTP server: support "writedelay" within
* krb4 support has been removed
* imap/pop3/smtp: added basic SASL XOAUTH2 support
* darwinssl: add support for PKCS12 files for client authentication
* darwinssl: enable BEAST workaround on iOS 7 & later
* Pass password to OpenSSL engine by user interface
* c-ares: Add support for various DNS binding options
* cookies: add expiration
* curl: added --oauth2-bearer option