Markdown support for notes and log calls (#544)

Close #506 
Fix #545

tests/Unit/CallTest.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace Tests\Unit;
+
+use App\Call;
+use Tests\TestCase;
+use Illuminate\Foundation\Testing\DatabaseTransactions;
+
+class CallTest extends TestCase
+{
+    use DatabaseTransactions;
+
+    public function test_call_note_returns_null_if_undefined()
+    {
+        $call = new Call;
+
+        $this->assertNull($call->getParsedContentAttribute());
+    }
+
+    public function test_call_note_returns_html_if_defined()
+    {
+        $call = new Call;
+        $call->content = '### test';
+
+        $this->assertEquals(
+            '<h3>test</h3>',
+            $call->getParsedContentAttribute()
+        );
+    }
+}