LUN-751 Fix corner cases of unquoted urls

* implement a filepath_to_url function that also quotes simpe quotes (inspired from filepath_to_uri)
* apply quoting before cleaning and normalizing the name. Otherwise files ending with question
  marks don't work
LUN-752 Preserve acls when performing file copy.
Merge pull request #9 from pbs/LUN-752

#LUN-752 and #LUN-751 Preserve acls on file copy and fix url quoting corner cases