Revert codec fix, endpoint now handles Exceptions instead of IonExceptions
Fix up exceptions in interceptors/messaging in endpoint layers
Merge pull request #338 from shenrie/master

Change to simplejson for reading data from broker management plugin to remove unicode
Merge pull request #334 from ooici/refactor_endpointexc

Revert codec fix, endpoint now handles Exceptions instead of IonExceptions
Fix exchange unit tests re json/simplejson
Fix endpoint unit tests
Fix exchange test for rabbit 3.x and bump ion-defs