Port english version of uploading file page for REST.
Port english version of downloading file page for REST.
Port english version of updating file page for REST.
Port english version of trashing and restoring page for REST.
Port english version of deleting file page for REST.
Port english version of publishing file page for REST.
Port english version of scoping file page for REST.
Fix scoping file page.
Merge pull request #60 from shinsuke-nara/file

Port english version of file storage section for REST