Use Flask-Security instead of Flask-HTTPAuth

requirements.txt

@@ -12,6 +12,7 @@ Flask-Migrate==2.0.0
 Flask-Principal==0.4.0
 Flask-RESTful==0.3.5
 Flask-Script==2.0.5
+Flask-Security==1.7.5
 Flask-SQLAlchemy==2.1
 Flask-WTF==0.13.1
 itsdangerous==0.24