Merge pull request #361 from sappo/master

libsodium fix as long a it is still broken
Fix invalid frame memory leak in s_beacon_recv
Merge pull request #362 from m-marsella/master

Fix invalid frame memory leak in s_beacon_recv
Merge pull request #363 from sappo/master

zmsg recv no wait extension
Update zsys.c

the self test forgets to delete the folder ".testsys"
(correct me if I'm wrong)
On my machine, this adjustment fixes the problem.
Merge pull request #364 from MilfordTea/master

Update zsys.c
put/get 8,16,32,64 bit numbers, and string in network byte order to a single frame