Added minimum rubocop setting.
Fixed warnings from Alias cop.
Merge branch 'feature/trema_run_port' of https://github.com/trema/trema into feature/rubocop
Fixed warnings from AlignArray cop.
Fixed warnings from AlignHash cop.
Fixed warnings from AlignParameters cop.
Check spec and cucumber files by rubocop.
Fixed warnings from AndOr cop.
Fixed warnings from StringLiterals cop.
Fixed warnings from SignalException cop.
Fixed warnings from SpaceAfterComma cop.
Fixed warnings from TrailingWhitespace cop.
Fixed warnings from RedundantSelf cop.
Fixed warnings from SpaceAroundBlockBraces cop.
Fixed warnings from Syntax cop.
Fixed warnings from SpaceInsideParens cop.
Fixed warnings from SpaceInsideBrackets cop.
Fixed warnings from MethodCallParentheses cop.
Fixed warnings from RedundantReturn cop.
Fixed warnings from LeadingCommentSpace cop.