improve 404 error management
Merge branch 'master' of https://github.com/gsaunier/open-miage-id-gui

Conflicts:
	src/OpenM-ID/gui/OpenM_IDCommonsView.class.php
	src/OpenM-ID/gui/OpenM_IDView.class.php
Merge pull request #10 from gsaunier/master

improve 404 management