Include a fuller list of response constants from libmemcached

[SpencerMalone]

So, I ran into a case where I was getting an error code 3 due to misconfiguration, which didn't map to any known error type in the PHP library. This led me to find https://bazaar.launchpad.net/~tangent-trunk/libmemcached/1.0/view/head:/libmemcached-1.0/types/return.h, and as far as I know, this should have been a MEMCACHED_CONNECTION_FAILURE . When I looked around, I noticed we were missing quite a few return types in php-land. I tried to find the ones that were absent and slot them in, and also worked to improve the ordering of most of them by redefining them in the order they were defined in return.h.

Things I don't know: Is this compatible with all supported libmemcached versions? How could I find out? I'm not super familiar with c level stuff, so bear with me here if you can!

[sodabrew]

Thanks! The Travis CI run shows that all supported versions have these constants defined. It is OK if this is the change that causes older versions that happened-to-still-work from no longer compiling.

[sodabrew]

Took me a while to diff this without whitespace (git diff -w) and sorted to identify just the additions:

+       REGISTER_MEMC_CLASS_CONST_LONG(RES_CONNECTION_BIND_FAILURE,   MEMCACHED_CONNECTION_BIND_FAILURE);
+       REGISTER_MEMC_CLASS_CONST_LONG(RES_CONNECTION_FAILURE,        MEMCACHED_CONNECTION_FAILURE);
+       REGISTER_MEMC_CLASS_CONST_LONG(RES_DATA_DOES_NOT_EXIST,       MEMCACHED_DATA_DOES_NOT_EXIST);
+       REGISTER_MEMC_CLASS_CONST_LONG(RES_DEPRECATED,                MEMCACHED_DEPRECATED);
+       REGISTER_MEMC_CLASS_CONST_LONG(RES_FAIL_UNIX_SOCKET,          MEMCACHED_FAIL_UNIX_SOCKET);
+       REGISTER_MEMC_CLASS_CONST_LONG(RES_INVALID_ARGUMENTS,         MEMCACHED_INVALID_ARGUMENTS);
+       REGISTER_MEMC_CLASS_CONST_LONG(RES_IN_PROGRESS,               MEMCACHED_IN_PROGRESS);
+       REGISTER_MEMC_CLASS_CONST_LONG(RES_MAXIMUM_RETURN,            MEMCACHED_MAXIMUM_RETURN);
+       REGISTER_MEMC_CLASS_CONST_LONG(RES_NO_KEY_PROVIDED,           MEMCACHED_NO_KEY_PROVIDED);
+       REGISTER_MEMC_CLASS_CONST_LONG(RES_PARSE_ERROR,               MEMCACHED_PARSE_ERROR);
+       REGISTER_MEMC_CLASS_CONST_LONG(RES_PARSE_USER_ERROR,          MEMCACHED_PARSE_USER_ERROR);
+       REGISTER_MEMC_CLASS_CONST_LONG(RES_READ_FAILURE,              MEMCACHED_READ_FAILURE);
+       REGISTER_MEMC_CLASS_CONST_LONG(RES_VALUE,                     MEMCACHED_VALUE);