Fixed model add & auth

mozen/src/main/java/mozen/auth/JwtAuthenticationFilter.java

mozen/src/main/java/mozen/business/IModelDao.java

mozen/src/main/java/mozen/business/IModelManager.java

mozen/src/main/java/mozen/business/IUserManager.java

mozen/src/main/java/mozen/business/ModelDao.java

mozen/src/main/java/mozen/business/ModelManager.java

mozen/src/main/java/mozen/business/UserManager.java

mozen/src/main/java/mozen/messages/LoginMessage.java

mozen/src/main/java/mozen/messages/ModelMessage.java

mozen/src/main/java/mozen/messages/ResponseMessage.java

mozen/src/main/java/mozen/messages/SignupMessage.java

mozen/src/main/java/mozen/messages/TagMessage.java

mozen/src/main/java/mozen/model/Model.java

mozen/src/main/java/mozen/model/Tag.java

mozen/src/main/java/mozen/model/TagCategory.java

mozen/src/main/java/mozen/utils/DatabaseFiller.java

mozen/src/main/java/mozen/web/ModelController.java

mozen/src/main/java/mozen/web/UserController.java