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.
Merge pull request #773 from pmienk/master

Move 'make code' from src/ to root
Add custom 'src' target.
Merge pull request #774 from pmienk/master

Add custom 'src' target.
Move 'make code' from src/ to root.
Add custom 'src' target.
Document ZUUID_LEN (fixes #776)
Merge pull request #778 from rrthomas/master

Document ZUUID_LEN (fixes #776)