Fixed HWM support, fixed shadow_copy linger
Merge pull request #219 from weberr13/addedHWM

Fixed HWM support, fixed shadow_copy linger
Merge pull request #213 from hintjens/master

Fixed use of inline to allow use of czmq_prelude.h in C programs on MSVC
Save ZPL values as strings, to guard against parsing on reload
Values in saved hash tables can contain '='
Fixes to header comment
Code cleanup