Fix #27: Propono should raise exception if topic_id is nil
Merge pull request #28 from iHiD/fix_27

Fix #27: Propono should raise exception if topic_id is nil
Add queue suffix
Cache bundler in Travis
Merge pull request #29 from iHiD/add_queue_suffix

Add queue suffix
Merge pull request #30 from iHiD/cache_bundler

Cache bundler in Travis
Allowing underlying Fog to be configured to use IAM credentials
Merge pull request #31 from ccare/enabling-iam-configuration

Allowing Propono to be configured to use IAM credentials