Merge pull request #252 from shenrie/master

Tweaking some exception handling with events
Merge pull request #253 from shenrie/master

Fixed failing pyon int tests
Better sysname prepend to queue name, fixes OOIION-699
Merge pull request #254 from daf/OOIION-699

Better sysname prepend to queue name, fixes OOIION-699
Bumped ion-defs