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* Always use password, setting in img_config.php, fix #78.
* Resize gif keeping transparency #81.
* Now returns statuscode 500 when something fails #55.
* Three different modes: strict, production, development #44.
* Three files for all-in-one `imgs.php`, `imgp.php`, `imgd.php` #73.
* Change name of script all-in-one to `webroot/imgs.php` #73.
* Combine all code into one singel script, `webroot/img_single.php` #73.
* Disallow hotlinking/leeching by configuration #46.
* Alias-name is without extension #47.
* Option `alias` now requires `password` to work #47.
* Support for option `password, pwd` to protect usage of `alias` and remote download.
* Added support for option `alias` that creates a link to a cached version  of the image #47.
* Create cache directory for remote download if it does not exists.
* Cleaned up `img_config.php` and introduced default values for almost all options #72.