Added send and alert windows and printError method
Send buttons on main window open child window to specify details.
UserOut has a new printError message for errors
printError uses the newly added Alert Window
Added toString method to Contact class
Added missing lib required for mail
Add About Window and Disabled Button functionality
Send Email to Selected and Remove Selected buttons are now disabled
when no contacts are selected
Merge pull request #14 from zlesperance/GUIWork

Gui work