big_red: Initial commit
big_red: Rename callback methods
big_red: Use "enum" instead of strings for status
big_red: Remove unnecessary try/except
big_red: Add handler for button release
big_red: Handle ctrl-c in run loop
big_red: Remove print statements from base class
setup: Make big_red installable
examples: Add boring example

Add an example that just prints the button's status.