Refactored permission system components

Split joint permission creation into chunks

Fixes #374

tests/Entity/EntitySearchTest.php

@@ -42,7 +42,7 @@ class EntitySearchTest extends TestCase
 
     public function test_book_search()
     {
-        $book = \BookStack\Book::all()->first();
+        $book = \BookStack\Book::first();
         $page = $book->pages->last();
         $chapter = $book->chapters->last();
 

tests/Entity/TagTest.php

@@ -1,5 +1,6 @@
 <?php namespace Tests;
 
+use BookStack\Role;
 use BookStack\Tag;
 use BookStack\Page;
 use BookStack\Services\PermissionService;

tests/Permissions/RestrictionsTest.php

@@ -226,6 +226,7 @@ class RestrictionsTest extends BrowserKitTest
             ->type('test content', 'html')
             ->press('Save Page')
             ->seePageIs($chapter->book->getUrl() . '/page/test-page');
+
         $this->visit($chapterUrl)->seeInElement('.action-buttons', 'New Page');
     }