Add some logging for IOError raised when accessing legacy export file path
Merge pull request #250 from Connexions/add-logging

Add some logging for IOError raised when accessing legacy export file pa...
Refactor legacy redirect code and create helper functions
Transform legacy module links within collections

Close Connexions/rhaptos.cnxmlutils#73
Merge pull request #246 from Connexions/transform-module-links

Transform module links