* add image cache expiry parameter
* change api call to be more JavaScript-eze
* add test
Merge remote-tracking branch 'origin/master' into image-cache-expiry
* allow cache hours to be a string
* add test for cache hours set with a string
Merge branch 'image-cache-expiry' of github.com:mobify/mobifyjs into image-cache-expiry
Rely on serverside API to provide error handling. Update tests.
Merge pull request #87 from mobify/image-cache-expiry

Add optional image cache expiry to the imageResize API