Merge pull request #1016 from hurtonm/master

NULL: Implement ERROR handling
initialize libsodium and tweetnacl
find libsodium with cmake
removed return code check for now, got -1 in test_security_curve.
ws
Merge pull request #1018 from soundart/master

curve: initialize crypto libs before usage
Issue #1017: add ZMQ_HANDSHAKE_IVL time limit on connection handshake
Merge pull request #1019 from willstrang/master

Issue #1017: add ZMQ_HANDSHAKE_IVL time limit on connection handshake
add untracked test_stream_timeout into .gitignore and tests/Makefile.am
Merge pull request #1022 from danielhtshih/master

add untracked test_stream_timeout into .gitignore and tests/Makefile.am
Split plain_mechanism into client and server part