update to version 1.5.0

* added REST server implementing OpenDHT proxy API
* tools: added simple Web client using the proxy server
* tools: allow dhtnode to run a proxy server
* tools: allow dhtnode to use any string as key
* InfoHash: added operator bool()
* minor performance improvement
* SockAddr: fix endianness issue
* net: fix incorrect reported address parsing
* minor memory leak fixes

CMakeLists.txt

 cmake_minimum_required (VERSION 3.1)
 project (opendht)
 set (opendht_VERSION_MAJOR 1)
-set (opendht_VERSION_MINOR 4.1)
+set (opendht_VERSION_MINOR 5.0)
 set (opendht_VERSION ${opendht_VERSION_MAJOR}.${opendht_VERSION_MINOR})
 set (PACKAGE_VERSION ${opendht_VERSION})
 set (VERSION "${opendht_VERSION}")

configure.ac

 dnl define macros
 m4_define([opendht_major_version], 1)
-m4_define([opendht_minor_version], 4)
-m4_define([opendht_patch_version], 1)
+m4_define([opendht_minor_version], 5)
+m4_define([opendht_patch_version], 0)
 m4_define([opendht_version],
 		  [opendht_major_version.opendht_minor_version.opendht_patch_version])