Updating Example project
code formatter
Fixing potential crash caused by failed validation with nil
Renaming methods in UnitTest
Changing validation logic from data to image
Fixing potential crash caused by "`ImageLoaderOperation`'s state is `Finished=YES` without being started by the queue"
Changing the queue that it call operation start
Merge pull request #5 from hirohisa/0.1.4

0.1.4