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* Moved functions from img.php to `functions.php`.
* Added function `trace()` to measure speed and memory consumption, only for development.
* Added fast cache #149.
* Added `imgf.php` as shortcut to check for fast cache, before loading `img.php` as usual, adding `imgf_config.php` as symlink to `img_config.php`.
* Created `defines.php` and moved definition av version there.
* Fixed images in README, #148.
* Initiated dependency injection to `CImage`, class names can be set in config file and will be injected to `CImage` from `img.php`. Not implemented for all classes. #151.
* Enabled debug mode to make it easier to trace what actually happens while processing the image, #150.