Merge pull request #192 from shemminger/master

ztree  update, fixes and redo with MIT code
Tentative fix for #187
Update flags to build on SmartOS / Solaris
zbeacon: improve search for interface to skip interfaces with null broadcast address, which happens on SmartOS / Solaris.

Refs #187
Merge pull request #193 from mattconnolly/master

Improved build support for Smart OS / Solaris
ztree.h was missing
Merge pull request #194 from hakankpunkt/master

ztree.h was missing in Makefile.am
libsodium not needed in Travic CI build
Updated man pages
Merge pull request #195 from hintjens/master

Minor project fixes
Fixed spelling
Merge pull request #196 from hintjens/master

Fixed spelling of variable name