Images and multipart uploads need to support binary data and setting MIME type

[brandonscript]

Currently you can only reference images by path. The camera control has to save the image to assets in order to have the photo accessed, and the multipart uploading only supports file urls.

Todo:

• Support for image storing binary data for presentation in Image control
• Variable util for converting image to NSData
• Multipart upload needs to support uploading binary data and multiple mime types

[brandonscript]

Partially complete via assets-library urls. Does not support direct binary data yet.