Add `EmojiReporter`. Fix #10

[phimage]

Name inspired from swiftlint

• Fix swiftlint warnings (whitespaces, blank lines)

  iblinter --path Tests/IBLinterKitTest --reporter emoji

  /Users/phimage/Dev/IBLinter/Tests/IBLinterKitTest/Resources/MacXibTest.xib is mac format and skipped.
  /Users/phimage/Dev/IBLinter/Tests/IBLinterKitTest/Resources/ConstraintTest.storyboard
  ⛔️ custom class name 'ViewController' should be 'ConstraintTest' 
  /Users/phimage/Dev/IBLinter/Tests/IBLinterKitTest/Resources/DuplicateConstraint.xib
  ⚠️ duplicate constraint Prh-uf-M6D (firstItem: ItZ-vi-bgh attribute: top secondItem: vUN-kp-3ea attribute: top)
  ⚠️ duplicate constraint aEU-56-OK8 (firstItem: ItZ-vi-bgh attribute: centerX secondItem: iN0-l3-epB attribute: centerX)
  /Users/phimage/Dev/IBLinter/Tests/IBLinterKitTest/Resources/ViewControllerTest.storyboard
  ⛔️ custom class name 'ViewController' should be 'ViewControllerTest'