Fix XCode's problem with trie test

Signed-off-by: Martin Sustrik <sustrik@250bpm.com>
Fix typos.

Signed-off-by: Martin Sustrik <sustrik@250bpm.com>
Clarify nn_symbol documentation.

Signed-off-by: Martin Sustrik <sustrik@250bpm.com>
Add missing protocol sockopts to nn_symbol

Signed-off-by: Martin Sustrik <sustrik@250bpm.com>
Inproc transport check whether two conneceting socket are compatible

'separation' test is also added to check the functionality.

Signed-off-by: Martin Sustrik <sustrik@250bpm.com>
nn_atomic class added

It represents 32-bit unsigned integer with associated atomic
operations.

Signed-off-by: Martin Sustrik <sustrik@250bpm.com>
Merge remote-tracking branch 'remotes/upstream/master'