Code cosmetics (change all single quotes to double quotes).
Code cosmetics (Replaced alias with alias_method).
Code cosmetics (use && instead of and).
Code cosmetics (avoid assignment in conditional).
Code cosmetics (have space around operators).
Code cosmetics (avoid multiple empty lines).
Code cosmetics (removed outcommented debug statement).
Code cosmetics (avoid lines >120 columns).
Code cosmetics (have a space after a comma).
Code cosmetics (avoid empty lines at start and end of body).
Fixed documentation of the Stop processor.
Code cosmetics (avoid trailing whitespace).
Code cosmetics (no "then" on multiline if/unless).
File.exists? is deprecated, replaced with File.exist?
Hash#has_key? is deprecated, replaced with Hash#key?
Since ! has become a method, use ternary syntax construct instead of double negation.
Code cosmetics (contract two nested unless into a single one).
Code cosmetics.