Almost finished XYPad, halfway through fixing number_dialer framing
Merge pull request #87 from bvssvni/master

Upgraded to latest Rust-Empty
Implemented xy_pad with example in all_widgets, clarified some behaviour in all_widgets
Removed unnecessary code
Merge pull request #88 from mitchmindtree/master

Implemented an XYPad widget with a usage demo in all_widgets.
Upgraded to latest Piston