making program yell at user for incorrect file path

taking out default file path.
making the program check if file is valid and is a process text file
(IE it should start with "PID")
changing file names to follow standard format
fixes a bug with user wanting to continue

fixes a bug where when the user says yes i wanna continue, the prompt
for the file gets printed twice.
also added error checking so the program will continue to prompt the
user if neither y or n is entered (otherwise the program will terminate
if anything other than y is entered)
Merge pull request #48 from rsingla92/CorrectingFileNames

Correcting file names and other bugs