Release of 3.0.4

Prevents error from throwing when you try to access an ItemList at a depth that is non-existent.

Release of 3.0.3

Prevents error from throwing when you try to access Items at a depth that is non-existent.

Release of 3.0.2

• Fixes setElement
• Added support for beforeContent and afterContent
  • http://vespakoen.github.io/menu/class-Menu.Items.Item.html#_setBeforeContent
  • http://vespakoen.github.io/menu/class-Menu.Items.Item.html#_setAfterContent
  • http://vespakoen.github.io/menu/class-Menu.Items.ItemList.html#_add
  • http://vespakoen.github.io/menu/class-Menu.Items.ItemList.html#_raw
  • http://vespakoen.github.io/menu/class-Menu.Items.ItemList.html#_addContent
• Added more PHP versions to travis config
• Added badges to the readme
• Rebuilt the API docs

Bump underscore-php version

Thanks to @freekmurze

Laravel 5 support

Thanks to @memco and @freekmurze