rubocop: Handled LiteralInCondition.
rubocop: Fixed method call parentheses.
rubocop: Let's only use 'raise', not 'fail'.
rubocop: Fixed a few redundant things in the code.
Fixed all the specs that had accidentally been broken during my use of rubocop.
rubocop: Handled the 'Void' cop.
rpicsim: Removed all remaining TODO items and fixed 'rake todo' so that it does not show its own source code (made it not look in the Rakefile).
Also fixed it so that it does not show an error if there are no TODO items.