Patch 0.1.2

[CyberDex]

Fixes and improvements:

• add addContent to the layout so it is possible to dynamically add layouts to the system
• anchor, anchorX and anchorY properties where added to style controller, to be able to set layout anchors
• getByID method added to ContentController to get the child by ID from the layout tree
• firstChild getter was added to ContentController to get the first child from the layout tree
• minWidth and minHeight was added to style controller
• fix: Size controller autosize was not including margins
• fix: There was an issue in Content controller when a content was set as an array of layout configs
• make layout display style to be 'inline-block' by default (before it was block)
• refactor Content controller
• added some storybooks