* Move a-b to PSR-4
* Move c-d to PSR-4
* Move e+g to PSR-4
* Move h-l to PSR-4
* Move m-r to PSR-4
* Move s-u to PSR-4
* Move files/ to PSR-4
* Move remaining tests to PSR-4
* Remove Test\ from old autoloader
The ETag set in the IF_NONE_MODIFIED header is wraped in quotes (").
However the ETag that is set in response is not (yet). Also we need to
cast the ETag to a string.
* Added unit test