yubico-c-client 2.10

[Simon Josefsson]

First release this year, yay.

Get it from: http://yubico.github.io/yubico-c-client/releases.html

Happy hacking,
/Simon

* Version 2.10 (released 2013-05-15)

** Add ykclient_global_init and ykclient_global_done.

** Add ykclient_version.h header file with versioning information.
New symbols are YKCLIENT_VERSION_STRING, YKCLIENT_VERSION_NUMBER,
YKCLIENT_VERSION_MAJOR, YKCLIENT_VERSION_MINOR,
YKCLIENT_VERSION_PATCH.  New function ykclient_check_version.

** Modified API to use 'ykclient_rc' enum as return type instead of 'int'.
** Enum also moved to separate new header file ykclient_errors.h.
This should be backwards compatible.  It makes the return type
clearer.  From Arran Cudbard-Bell <a.cud...@freeradius.org>.

** Improve curl multi usage.
From Arran Cudbard-Bell <a.cud...@freeradius.org>.

** ykclient: Cleanup command line tool a bit to make it more useful.
Added --help, --version and --debug.  Defaults to silent output.  Exit
codes are documented and more useful.  Added manpage.