New code for bills.

app/Repositories/Bill/BillRepositoryInterface.php

@@ -0,0 +1,51 @@
+<?php
+/**
+ * Created by PhpStorm.
+ * User: sander
+ * Date: 25/02/15
+ * Time: 07:40
+ */
+
+namespace FireflyIII\Repositories\Bill;
+
+use FireflyIII\Models\Bill;
+use FireflyIII\Models\TransactionJournal;
+
+/**
+ * Interface BillRepositoryInterface
+ *
+ * @package FireflyIII\Repositories\Bill
+ */
+interface BillRepositoryInterface {
+
+    /**
+     * @param Bill $bill
+     *
+     * @return Carbon|null
+     */
+    public function nextExpectedMatch(Bill $bill);
+
+    /**
+     * @param array $data
+     *
+     * @return Bill
+     */
+    public function store(array $data);
+
+    /**
+     * @param Bill  $bill
+     * @param array $data
+     *
+     * @return mixed
+     */
+    public function update(Bill $bill, array $data);
+
+    /**
+     * @param Bill               $bill
+     * @param TransactionJournal $journal
+     *
+     * @return bool
+     */
+    public function scan(Bill $bill, TransactionJournal $journal);
+
+}