0.4

This is a pre-release and it might include small BC breaks.

• Added "vertical layout" template - thanks @cavasinf
• Added RTL support - thanks @kevinpapst
• Add status_position to card embed - thanks @wucherpfennig
• Add block body_class to templates - thanks @wucherpfennig
• Add "status indicator" component - thanks @cavasinf
• Added "steps" component - thanks @cavasinf
• Fix actions display on small screens - thanks @wucherpfennig
• Fix menu badge issue on first level - thanks @kevinpapst
• Allow more symfony versions - thanks @kevinpapst
• Added preview screenshot for docs - thanks @cavasinf
• Upgrade phpunit - thanks @kevinpapst