Improvements and fixes

• invoice file name changed from invoice id to invoice number
• invoice number generation fixes
• sent order number in OrderPlaced event instead of the whole order object
• reacting with OrderPlaced event on doctrine event rather than state machine callback

Shop billing data listed on invoice

• Shop billing data listed on invoice view (both pdf and in Admin Panel)

Installation facilitation vol.2

• installation process better explained in README file
• final entity bug resolved

Installation facilitation

• Sequence resource configuration moved to php
• KnpSnappyBundle configuration mentioned in README file

Crucial Customer and Admin features regarding invoicing

• receiving an email with attached Invoice as pdf file when Invoice is paid
• resending Invoice to a Customer from Admin panel
• downloading Invoice from Admin's Invoice view
• invoiceNumber generated sequentially added to Invoice entity
• downloading Invoices from Customer's Order view

Maintenance fixes

• installation instruction added
• missing migration added
• extension points explained

Initial InvoicingPlugin release

• invoice containing basic data created once an order is placed
• [admin] invoices browsing
• [admin] invoices related to the order displayed on order view
• [admin] invoice downloading
• documentation