Remove call to Slim::registerAutoloader as Composers vendor/autoload is used instead.
feature/Controller: refactor to use route groups
feature/Controller: Add controllers

- Currently this simply delegates to the existing code.
feature/Controller: Moving inventory.inc to controller
feature/Controller: inventory.inc -> InventoryLocations
feature/Controller: bankaccounts.inc -> BankAccounts
feature/Controller: category.inc -> Category
feature/Controller: items.inc -> InventoryLocations and InventoryCosts

- items.inc is not yet completely removed.
feature/Controller: currencies.inc -> Currencies
feature/Controller: customers.inc -> Customers
feature/Controller: glaccounts.inc -> GLAccounts
feature/Controller: suppliers.inc -> Suppliers
feature/Controller: taxgroups.inc -> TaxGroups
feature/Controller: taxtypes.inc -> TaxTypes