Add example PDFs

[Schrank]

We should add example pdfs for invoice, creditmemo and shipping.

We should add examples for one and two currencies, custom options, config, bundle, grouped and simple products.

• one currency
• two currencies
• custom options
• config product
• bundle product
• group product
• simple product
• different orders of columns
• Different tax percentages
• custom notes
• with logo
• without logo
• show customer IP
• different address templates
• footer
• custom font
• invoice maturity
• with barcode
• comments