Create notes-to-json.py

Began writing a script notes-to-json.py that will convert character notes to JSON data about nodes and connections. Character notes will take the same form as the sample file characters.txt; so far, notes-to-json.py reads in notes and identify the unique nodes, i.e. characters. Helpful resources while writing this far: http://stackoverflow.com/a/11860531, http://stackoverflow.com/a/23889306, _Python for Data Analysis_.