revert to 5.3 for now

Author: Bart Verwilst

composer.json

@@ -6,7 +6,7 @@
     "type": "project",
     "require": {
         "php": ">=5.6.4",
-        "laravel/framework": "5.4.*",
+        "laravel/framework": "5.3.*",
 	"dingo/api": "1.0.x@dev",
 	"tymon/jwt-auth": "1.0.*@dev",
 	"darkaonline/l5-swagger": "~3.0"