release 1.1.0-beta2

release 1.1.0-beta2

**Changes from beta1:**

* Fix [gh #103](https://github.com/m6w6/libmemcached/issues/103):
  Build failure on 32-bit.
* Fix [gh #102](https://github.com/m6w6/libmemcached/issues/102):
  Doc build with old sphinx.
* Fix [gh #100](https://github.com/m6w6/libmemcached/issues/100):
  Revert symbolic rename of public header include directories.
* Fix [gh #98](https://github.com/m6w6/libmemcached/issues/98):
  Library SONAMEs and NAME_LINKs differ from 1.0.18.
* Fix [gh #97](https://github.com/m6w6/libmemcached/issues/97):
  Location of cmake files installation directory.
* Fix [gh #96](https://github.com/m6w6/libmemcached/issues/96):
  LIBXXX_VERSION_HEX constants format.