Rename modules to simply `diskfile` & `server`
Remove "Scality" in class name
Merge pull request #11 from scality/rename-modules

Rename modules to simply `diskfile` & `server`
Partialy fix pep8

We still make some exception
Merge branch 'pep8' of github.com:scality/ScalitySproxydSwift into pep8

Conflicts:
	setup.py
	swift_scality_backend/diskfile.py
	swift_scality_backend/server.py