Merge pull request #508 from hintjens/master

IPv6 related changes and cleanups to test cases
Merge pull request #509 from hintjens/master

Added IPv6 option to context
LIBZMQ-497 there could be unsent bytes in encoder

When we send a large message, the message can be splitted into two chunks.
One is in the encoder buffer and the other is the zero-copy pointer.
The session could get the term before the last chunk is sent.
Merge pull request #510 from miniway/master

LIBZMQ-497 there could be unsent bytes in encoder
Corrected linking error in MSVC build

MSVC build fails with linking errors for unresolved symbols SetSecurityDescriptorDacl and InitializeSecurityDescriptor in signaler.obj
Adding the relevant link library (Advapi32.lib) to VCLinkerTool fixes this (tested MSVC2010 on XP and Win7)
Merge pull request #511 from mjasperse/patch-2

Corrected linking error in MSVC build
solved broken tests compilation
Merge pull request #512 from montoyaedu/master

broken tests compilation. Makefile.am
Some DNSs will resolve ANY domain name so I made more reliable errors.