[php/libraries] Module.class.inc fixes slash bug when including directory for endpoint.

[maltheism]

Brief summary of changes

This bugfix fixes the incorrect slash in front of the class name and such as when including a directory for endpoint php classes.

Example: module/php/endpoints/classnames.class.inc
Instead of the usual module/php/classnames.class.inc

[xlecours]

This is working fine as long as the namespace follows the file system directory tree.
e.g: from a file is \LORIS\<module> namespace, to load the file D.class.inc in the /modules/<module>/php/A/B/C directory, one should call $d = new A\B\C\D();
And in the D.class.inc file, the should be a namespace LORIS\<module>\A\B\C; line