Added clients, products and invoices to the application.
Added SellPositions as a many to many relationship.
Tidying up...
Added products stub to invoice. Also added client selection to invoice.?
Added products stub to invoice. Also added client selection to invoice.
Merge remote branch 'origin/t001_add_products_client_and_invoices' into t001_add_products_client_and_invoices
Some draft code..
Added possibility of sell positions. The code needs to beautified.
Added some logic to invoice show and corresponding models.
Removed obsolete comments.
Refactoring...
Moved back original validation with temporary, primitive modification.
Refactoring...
Added printed invoice template.
Prepared new layout.
Nicyfication... :P
Updated template.
Modified client edit and delete properly.
Modified products do get edited and deleted properly.
Stylization.