Release Version 1.1.0

• Fix issue where unplugging the joystick would not cause a disable and exit
• FIx issue where a single enable or disable button press would register multiple presses
• Add control instructions on startup after successful initialization
• Change signal handling method to use sigaction rather than signal
• Improve steering control

Release Version 1.0.0

Merge pull request #1 from PolySync/maint/cleanup

Miscellaneous cleanup