yusuke/twitter4j — pull request #56 by nivs (2012-07-09 21:28:25+00:00)
Title: Make the various sizes in 'media.sizes' optional in MediaEntityJSONImpl

Make the various sizes in 'media.sizes' optional in MediaEntityJSONImpl
see discussion here https://groups.google.com/d/topic/twitter4j/mJiBVTGyOOQ/discussion