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
Fixed execute bit
Merge pull request #197 from hintjens/master

Fixed execute bit wrongly set on some files