Add mtime and checksum methods to the filesystem
Add mtime and checksum methods to the filesystem

KnpLabs/Gaufrette,KnpLabs/Gaufrette,ronaldlopez/Gaufrette,1001Pharmacies/Gaufrette,jenkoian/Gaufrette,alex88/Gaufrette,WayOfBrave/Gaufrette,WayOfBrave/Gaufrette,1001Pharmacies/Gaufrette,NiR-/Gaufrette,peelandsee/Gaufrette,Consoneo/Gaufrette,acucchieri/Gaufrette,acucchieri/Gaufrette,jenkoian/Gaufrette,igormukhingmailcom/Gaufrette,ronaldlopez/Gaufrette,NiR-/Gaufrette,watermanio/Gaufrette,igormukhingmailcom/Gaufrette,alex88/Gaufrette,watermanio/Gaufrette