CustomsOffices are now added to planets by default. This partially reverts the previous commit.
Move gtk helper classes off to view/gtk_helpers/.
Move the version number out of the about menu and into a constant in RubyPI class.
Update Rakefile to use RubyPI::VERSION and include gtk_helpers/ folder.
Remove unnecessary source and deploy tasks.
Fix failing test due to gtk_helpers/ move.
Add CCP copyright notices to About box.