clean up restore.py
expose process_cases as a main entry point more intentionally
don't pass in unnecessary default version

all callers of generator.get_fixtures should pass in version explicitly (and do)
Merge pull request #143 from dimagi/fixturegenerators

don't pass in unnecessary default version
Merge pull request #142 from dimagi/cleanup

Expose process_cases more intentionally
Merge branch 'master' into commtrack

Conflicts:
	casexml/apps/phone/restore.py