Major Commit

For the AuthorshipAnalysis.java class most of the function has been
taken out of this class and made more into a driver class.
The Book class has all methods done except the Metric calculations.
getTextFromFile.java call both methods for extracting text form file
with all logic that is needed for that.
AuthorMetrics.java has had all getters and setters updated to reflect
the changes made in the Book.java class.
CHECK ALL RETURN TYPES AND INPUT VARIABLES
Not sure if this file was pushed with last commit
AuthorMetrics

AuthorMetrics does not seem to want to be push please use this last
file, I hope all changes have been saved.