last commit, merge from 1.4.0
last commit, merge from 1.4.0

zhounanshu/Flask-AppBuilder,qpxu007/Flask-AppBuilder,qpxu007/Flask-AppBuilder,zhounanshu/Flask-AppBuilder,qpxu007/Flask-AppBuilder,dpgaspar/Flask-AppBuilder,zhounanshu/Flask-AppBuilder,dpgaspar/Flask-AppBuilder,rpiotti/Flask-AppBuilder,zhounanshu/Flask-AppBuilder,rpiotti/Flask-AppBuilder,rpiotti/Flask-AppBuilder,dpgaspar/Flask-AppBuilder,rpiotti/Flask-AppBuilder,qpxu007/Flask-AppBuilder,dpgaspar/Flask-AppBuilder