Small improvements to zlist

- improved some method documentation
- zlist_dup now copies autofree property as well
Trivial code cleanups
Removed empty ChangeLog
Updated man pages
Was missing API export for zhash_unpack
Clarified zlist manpage
Renamed zuuid_cpy to zuuid_export for clarity
Added access to uuid binary value
Added zuuid_dup method
Merge pull request #304 from hintjens/master

Minor project cleanups
Merge pull request #306 from pijyoi/master

add additional test for zsys_vprintf exposing bug in implementation
Fixed issue #307
Merge pull request #308 from hintjens/master

Fixed issue #307
Bumped version on development master to 2.1.0
Merge pull request #309 from hintjens/master

Bumped version on development master to 2.1.0
Man page updates
Restored variable string processing for MSVC

- define va_copy in czmq_prelude.h if needed, on Windows platforms
- uses simple copy, as suggested in this Stackoverflow post:
  http://stackoverflow.com/questions/558223/va-copy-porting-to-visual-c
- uses va_copy/va_end before all use of va_list item
Install the project generation scripts into /usr/local/bin

* Lets any project use the CZMQ code generation tools
Merge pull request #310 from hintjens/master

Fixed variable string processing