Change indentation to 4 spaces and removed closing php tag.
Indenting and PSR2 styling
No need for the else, script dies if config can't be loaded
File is being included unconditionally, require_once suggested by PHP Code_Sniffer
EditorConfig FTW! Please respect the settings and get plugin for your favourite editor from the site.
Variable $last gets defined always, no need for the else statement
PHPDoc effort: Included all current contributors, updated version date, fixed ordering and the license order to from link/text to text/link.
Ignore .idea folder from the project. .idea contains editor specific files (Used by PHPStorm and maybe others).
Drop indentation by one.