Problem: zsock_new_sub ignores subscription

Solution: fix this.
Merge pull request #760 from hintjens/master

Problem: zsock_new_sub ignores subscription
Problem: inttypes.h not available for MSVC, to provide PRId64

Solution: define PRId64 conditionally for Windows
Merge pull request #763 from hintjens/master

Problem: inttypes.h not available for MSVC, to provide PRId64
Define PRId64 as string literal.
Match s_client_execute prototype to implementation.
Fix 'forcing to bool' msvc warning.
Merge pull request #764 from evoskuil/master

Build breaks in msvc 2010/12/13.
Update zsys.c

Add missing close
Update zfile.c

Fix missing free
Update zsys.c

Add missing free
Merge pull request #769 from wysman/patch-2

Update zfile.c
Merge pull request #770 from wysman/patch-3

Update zsys.c
Merge pull request #768 from wysman/patch-1

Fix #766
Correct gsl to generate Makemodule.am instead of Makefile.am.supplement.  Move src/Makefile.am to src/Makefile
Restore 'doc' to recursive make, matching libzmq.
Revert experimental make root invocation.
Fix break introduced by #768.
Merge pull request #771 from pmienk/master

Correct doc generation, restore make target results into previous structure.
Move 'make code' from src/ to root.