add a fallback if STUN to outside server isn't possible
Merge pull request #1076 from birarda/assignment

major NodeList communication changes
Merge branch 'master' of github.com:worklist/hifi into graceful-stun-fail
Merge pull request #1078 from birarda/graceful-stun-fail

fallback for STUN communication error/failure
add local node information to assignments JSON