Extra features

[SaFrMo]

• Add the ability to add sprite via JSONAtlas or JSONArray by declaring key and frame for the fill or background
• Add example and .gif of this functionality
• Add the ability to display the remaining amount of the bar with the following styles ( 10/100, 10%, 100), via Phaser.Text or Phaser.BitmapText
• Add ability to offset position of the bar
• Add functionality for horizontal and vertical bars
• Add functionality to stack bars like adding x amount of bars on next / on top of the others