Add gulp to the scaffolding options

[bramsmulders]

• [x] Styles
• [x] Merge-json
• [x] Patternlab
• [x] Copy
  • [x] Styleguide
  • [x] Annotations
  • [x] Images(Copy, Watch)
  • [x] Fonts(Copy, Watch)
  • [x] JavaScript(Copy, Watch)
  • [x] Bower(Copy, watch)
• [x] Watch
• [x] Browsersync
• [x] JSHint
• [x] Modernizr
• [x] Stylelint
• [x] Seperate folder(copy & clean actions)
• [x] Think of default development watch task
• [x] Cleanup code
• [x] Gulp notify
  • [x] Styles
  • [x] jshint
  • [x] stylelint
• [x] Code review
• [x] Test
• [x] Update readme