Refresh RuboCop config
Actually run the tests again. Damnit, `#exec`!

Also generate encoding comments for all the files, needed for 1.9.3.
Style/WhileUntilDo
Style/UnneededPercentQ
Style/UnlessElse
Style/TrivialAccessors
Style/Tab
Style/TrailingBlankLines
Style/SpecialGlobalVars
Style/SpaceInsideParens
Style/SpaceInsideHashLiteralBraces
Style/SpaceInsideBlockBraces
Style/SpaceBeforeBlockBraces
Style/SpaceAroundOperators
Style/SpaceAroundEqualsInParameterDefault
Style/RedundantException
Style/EmptyLineBetweenDefs
Style/ClassAndModuleChildren
Style/CollectionMethods
Style/CommentAnnotation