Copies mailroom.py from session03
Adds safe_input() and some more exception handling
Adds a script that prints the full paths of all files in the current directory
Adds a little script (copyfile.py) that copies file contents
Changes data structures in mailroom to dicts
Moves letter string generation to its own function, uses new string formatting syntax
Adds option to write letters to files
Updates selection handling to better use the options dictionary
Merge pull request #39 from jbbrokaw/paths-file-processing

Paths file processing