Merge pull request #78 from pthedinger/master

More segfault fixes and correcting naming of a function and variable.
Merge pull request #1 from ajwlucas/master

Bug fixes and beginning of AECP address access packet send/receive
Merge github.com:audioscience/avdecc-lib
Making I/O operations atomic so they don't get merged with notification messages.
Re-factoring common code.
Adding a 'show connections' command.
Prevent empty lines being added to the history and causing 'Invalid Command' messages.
Disables BPF buffering on OS X. 

Appears to solve issue of packet drop/ non-event 
on receive.
Return correct status from address access reply.
Sets missing is_notification_id_valid flag for AA msgs.