Fix Whitespace issues
Add the ability to delete posts by duplicate title

Fix #56
Make Bulk_Delete class a singleton

Also modify the way files are included
Move deprecated code and functions to a separated file
Add a new page that displays system information for debugging

Fix #57
Add the ability to filter the text that is displayed in admin footer
Change the menu text for schedules page
Convert line ending to unix

Also fix indent issues and align phpDoc comments
Add EDD Plugin Update Class
Move delete page modules to a separate page
Add the ability to handle licenses
Change milestone from 4.5 to 5.0

5.0 is a major release, so changing it from 4.5 to 5.0
Fix license handling if more than one addon is active
Add addon name in activation and deactivation messages
Better handling of failure cases during license key activation
Fix "+" sign in addon name in update plugin screen
Check if license is valid before invoking auto-updater
Add space after Addon name in license form
Major Refactoring

- Move all static request functions to individual classes
- Replace monstrous request handler routine with custom hooks
- Replace custom message displaying logic with `add_settings_error`
  function call (Fix #61)
Update screenshots