Made the library available through composer

autoloader.php, reasons for staying:
* I want the whole thing usable without composer, just
  download - unzip - include("autoloader.php")
* Composer (php's problem) does not have file watching
  capabilities and one has to run install each time that a
  new class is added.

Thoughts to consider:
* Move the source files to a src folder to separate them
  from the tests and the configuration files
* Change the names of the files and capitalize the folders
  to allow for psr-0 autoloading.