replace manual json headers with laravel response()->json()

better Carbon dependency
rename admin.nodes.configuration-token route
style fixes

database/migrations/2017_01_07_154228_create_node_configuration_tokens_table.php

@@ -18,8 +18,7 @@ class CreateNodeConfigurationTokensTable extends Migration
             $table->char('token', 32);
             $table->timestamp('expires_at');
             $table->integer('node')->unsigned();
-            $table->foreign('node')
-                ->references('id')->on('nodes');
+            $table->foreign('node')->references('id')->on('nodes');
             $table->timestamps();
         });
     }