zendesk/zendesk_apps_support — pull request #64 by adammw (2014-04-04 02:57:20+00:00)
Title: [LM-236] Validate banner image

:koala::+1:

/cc @zendesk/quokka

### Description
Validate that the banner image, if it is included in the zip file, is of the correct format and size.

### References
- Jira link: https://zendesk.atlassian.net/browse/LM-236

### Risks
- None