Merge pull request #18 from devaroop/master

Moving Refund to ruby client models
Bump killbill-client version
Fixes after jaxrs refactoring:
- Credit creation
- Charge creation
- Subscription endpoint
- Invoice balance in timeline
- Emtpy billing policy
Missing Gemfile.lock
Update killbill-client and small fix for refund in killbill_helper
Increment version for release
Update killbill-client for killbill model update see killbill/killbill#88
Missing Gemfile.lock
Fix issue with missing reinstate controller call
Change default cancellation to be EOT
Bump version for release
killbill_helper: fix get_bundle_by_external_key implementation

The API has changed and now returns a list of bundles.

Signed-off-by: Pierre-Alexandre Meyer <pierre@ning.com>
Moved credit creation to killbill client ruby