Refactored Application

+Class AuditAppl
-Modified the Arraylist<Course> lefttoTake: did need to declare a new
Arraylist
-Deleted Uneeded extra space
+Class Audit
-Made ArrayList<Course> curriculum and transcript a constant
-Modified degreeAudit method for clarity
-changed  ArrayList<Course> courses to
coursesLeftToTake
-Modified readCourses method to close file and decrease use of unneeded
lines  by putting declaration of variables within while statement
+Class Course
-To git rid of warning line under method name toString, placed @Override
over the method