Cosmetic changes
Problem: zuuid API man page empty

Solution: fix interface tags in zuuid.h
Rebuilt README.md

- 'gitdown README.txt'
- fixes #431
Problem: can't end timers after zloop exit

- zloop_timer_end always stored timers on zombie list; however it
  only processed that list inside reactor. So if reactor was already
  terminated, and then caller tried to end timers, result was an
  assertion failure in zloop_destroy, as self->zombies was not empty.
- solution is to mark zloop as terminated when it exits reactor loop
  and then not use zombie list, on a terminated zloop.
Include zmq_utils.h

- Fixes #438
- zmq_z85_* methods were removed from zmq.h, as they belong in zmq_utils.h
Fixed missing CZMQ_EXPORT.
Removed redundant newlines in zlog foreground output
Merge pull request #439 from mditzel/master

Fixed missing CZMQ_EXPORT.
Merge pull request #430 from hintjens/master

Cosmetic changes
Added missing library dependencies for MinGW
Merge pull request #441 from mditzel/master

Fix #440: Added missing library dependencies for MinGW
Use system uuid functions in zuuid

On OS X, libuuid is part of the base system, however isn't found by
autoconf as might be expected. Consequently this commit adds an explicit
check for OS X and defines the HAS_LIBUUID symbol if that is what we are
running. This makes zuuid_new() significantly faster on OS X.
Merge pull request #442 from jen20/master

Use system uuid functions in zuuid.c
Change ToolsVersion to 4.0 for VS2010
Change libsodium locations to defaults for VS2010
Merge pull request #443 from HughPowell/master

Update project files for VS2010