changed tests to test src files, not dist
added test if uploadCompleted is called by images.uploadFIles
changed test if uploadCompleted is called
changed test if uploadCompleted is called
Make it possible to format the data that's sent.
Fix issue where uploadCompleted doesn't get called
Merge pull request #12 from miloshadzic/upload-callback

Make it possible to format the data that's sent.
updated comments and readme