Start implementing multiple author support

Prompts should all have been changed to reflect multiple author support.  All places where the program isn't just stupidly printing off the book make things look nice.
Multiple Author Support Complete

Prompts and outputs have all been changed to represent the new philosophy on multiple authors.  Multiple authors should be 'officially' supported now.  While not elegant, all necessary features function with multiple authors.

Close #6
Merge branch 'feature/multiple_authors' into develop