"Pythonized" script more

You say you wanted to make this script for GUI based system. You are probably going to want to make it def oriented that way certain buttons you click can call functions. Also look into optparse for cmd-line based running. Added a field where you can specify file type, there are various files other than .txt that you could parse. 

Summary:
- Changed readme to reflect changes
- added filetype users should be able to parse/change any file type not just txt files
- Removed some dependencies on args, really should look into working with optparse