ADD: Replace _config.php with new _config/config.yml
FIX: Correct spelling mistake in method name
FIX: Rename method to be more distinct
FIX: Check that the image exists and is not empty
FIX: Check that the Parent method exists before calling it
FIX: Ensure that the placeholder image respects width and height
FIX: Downgrade the version requirement to 3.0
Merge branch 'release/3.0.1'
ADD: Create method for returning just the placeholder url
Merge branch 'release/3.1.0'