some requeirment added to add new class
some changes, but we are no longer need it
able to add new coures and remove courses, edit courses
see commit in main frame
removing all the JDialog versions
able to view hw and test by clicking the menu button
change the JDialog to JPanel without any functions
add isNewCourse in the mycourse object
zach and I changed something in openfile.java
Merge pull request #60 from LilongHuang/branch2

A lot changes