Added the flip constants
Moved the modify wrapper from the abstract to the driver specific class
Added the flip method
Added the resize method
Changed 'is_null' in '!isset', || in 'or', && in 'and'
Added the relative dimensions parser
Renamed the import of the wrapper class
Added the resize test
Added the ratio-resize test
Added the upsized resize test
Added the blocked upsized test
Modified the PHPDoc to allow also relative resizing
Modified the PHPDoc to allow also relative resizing
Added the relative resize test
Added the flip test
Added the manipulate test
Added the transparency preservation
Added the image destructor
Added the copy function
Modified the _modify method to use the copy method of the ImageInterface