Merge pull request #4 from brettRoser/master

Moved the setSize and setVisible methods to the GolfView.
Merge pull request #5 from brettRoser/master

Created a file for String constants and start better organizing code
Removed hardcoded string values in JTextFields and other components. Those have been replaced with StringConstants in the StringConstants class. I also added an exceptions package where I added a DateFormatException which is fired if an invalid date is entered.