Fix hiredis getaddrinfo leak

Fixed in Redis by 1a5e5b6, but since that part of code
is largely copy/paste from Redis, the fix needs to be
ported over too.

Closes #2012
Redis 2.8.17
Merge branch '2.8antirez' into 2.8
Added a project to take current redis version number in src\version.h and propagate this number into the release documentation and the name of the release zip file. This replaces the powershell script used previously to build the binary release package zip.