Preparations

• apply patch from D368

Testing

• test using Image field of poll unit
• set storage_format option of above field to resize:100x100;output_format:jpg
• when you need to test image format change upload png instead of jpg image
• when you need to test storage engine in work set storage_engine field option to StorageEngine::HASH

Test these cases in every possible combination (8 in total):

1. case by uploader type:
   • HTML4 uploader ("inp_edit_upload" block)
   • HTML5 uploader ("inp_edit_swf_upload" block)
2. case by file extension change upon resize via "storage_format" option:
   • file extension changed
   • file extension not changed
3. case by storage engine:
   • storage engine used
   • storage engine not used