Add play_ray action
Strip trailing whitespace.
Add '()' around parameter lists in method definitions.
Use '[]' instead of 'Array.new'
Convert multiline { } to do..end.
Convert double-quoted strings to single-quoted strings when there is no interpolation.
Change 'Exception' to 'StandardError'.
Changing 'if !condition' to 'unless condition'.
Remove unnecessary 'begin..end'
Remove unnecessary 'return'
Shorten multiline conditionals