Fixed a bug when thumbnail URL is bad.
Fixed the DictDiffer for unicode type.
Added test for bad url.
Added test for bad url.
Added a function for printing test Akara's error log.
Added download_preview config to test config.
Added function for getting the thumb_path.
Finished the test for downloading a thumbnail.
Added more precise description for DictDiffer changes.
Cosmetic changes in download_preview module.