Started work towards adding role view permissions

Work halted as re-write required.
In reference to #92

database/migrations/2016_04_09_100730_add_view_permissions_to_roles.php

@@ -0,0 +1,54 @@
+<?php
+
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Migrations\Migration;
+
+class AddViewPermissionsToRoles extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        $currentRoles = \BookStack\Role::all();
+
+        // Create new view permissions
+        $entities = ['Book', 'Page', 'Chapter'];
+        $ops = ['View All', 'View Own'];
+        foreach ($entities as $entity) {
+            foreach ($ops as $op) {
+                $newPermission = new \BookStack\Permission();
+                $newPermission->name = strtolower($entity) . '-' . strtolower(str_replace(' ', '-', $op));
+                $newPermission->display_name = $op . ' ' . $entity . 's';
+                $newPermission->save();
+                foreach ($currentRoles as $role) {
+                    $role->attachPermission($newPermission);
+                }
+            }
+        }
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        // Delete the new view permissions
+        $entities = ['Book', 'Page', 'Chapter'];
+        $ops = ['View All', 'View Own'];
+        foreach ($entities as $entity) {
+            foreach ($ops as $op) {
+                $permissionName = strtolower($entity) . '-' . strtolower(str_replace(' ', '-', $op));
+                $newPermission = \BookStack\Permission::where('name', '=', $permissionName)->first();
+                foreach ($newPermission->roles as $role) {
+                    $role->detachPermission($newPermission);
+                }
+                $newPermission->delete();
+            }
+        }
+    }
+}