prepare v1.1.4

prepare v1.1.4

* Fix [gh #107](https://github.com/awesomized/libmemcached/issues/107):
  macOS: deprecated sasl API (improve detection of `libsasl2`).
* Fix [gh #131](https://github.com/awesomized/libmemcached/issues/131):
  Consider renaming tools (add `CLIENT_PREFIX` build option; default: `mem`)
* Fix [gh #132](https://github.com/awesomized/libmemcached/issues/132):
  Add build of static library (add `BUILD_SHARED_LIBS` build option; default: `ON`).
* Fix [gh #134](https://github.com/awesomized/libmemcached/issues/134):
  Update client option documentation.
* Fix [gh #136](https://github.com/awesomized/libmemcached/issues/136):
  `libmemcachedutil` is underlinked (link against libmemcached).
* Fix [gh php-memcached#531](https://github.com/php-memcached-dev/php-memcached/issues/531):
  `get` returns random values when lower than default `OPT_POLL_TIMEOUT` is set.