Add an environment variable for the directory of failed image diffs
Save diff image if test failed
* Compare images with bytes for better results
* Fixes #4
Merge pull request #3 from AutoScout24/image-diff-dir

Add an environment variable for the directory of failed image diffs
Added Travis-CI.
Merge pull request #11 from dblock/travis-ci

Added Travis-CI.
Remove if check, because free can be called on NULL
Correct variable name
Take account of retina scale for diff images
Apple recommend 0.0 for automatically set to the scale factor of the device’s main screen
Merge pull request #5 from AutoScout24/image-diff

Save diff image if test failed
Add comment why MIN is used
Add missing assert
Merge pull request #6 from AutoScout24/image-compare-changes

Compare images with bytes for better results
Add default value FB_REFERENCE_IMAGE_DIR
Add test target + image comparison tests
Fix plist path
Revert "Merge pull request #5 from AutoScout24/image-diff"

This reverts commit 20c4a5a352f148df378c65586acb916c2dc2dc42, reversing
changes made to cf2c855e88b421d679b93b5f0d382b530a29d7f8.
Revert "Merge pull request #6 from AutoScout24/image-compare-changes"

This reverts commit 6c60b00f43c82313811e26b81e4dca407aa86182, reversing
changes made to 20c4a5a352f148df378c65586acb916c2dc2dc42.
Save diff image if test failed
* New approach for #5
* Image diff algorithm in own UIImage category