Added activity history to to all entities. Fixes #12

app/Activity.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace Oxbow;
+
+use Illuminate\Database\Eloquent\Model;
+
+/**
+ * @property string key
+ * @property \User user
+ * @property \Entity entity
+ * @property string extra
+ */
+class Activity extends Model
+{
+    public function entity()
+    {
+        if($this->entity_id) {
+            return $this->morphTo('entity')->first();
+        } else {
+            return false;
+        }
+    }
+
+    public function user()
+    {
+        return $this->belongsTo('Oxbow\User');
+    }
+
+    /**
+     * Returns text from the language files, Looks up by using the
+     * activity key.
+     */
+    public function getText()
+    {
+        return trans('activities.' . $this->key);
+    }
+
+}