change to click library
remove manager from __all__
make -c option decorator and auto run config
add application context(app.context()) to get current_app in get_database_engine()
remove __main__ entry because can't test it
CLI test (It has some problem. see PR to detail.)
add install_requires
change command option order
change command option order
split test and remove some test
remove
remove Exception name printing
remove using ipython, bpython features from shell command
remove Flask-Script dependence
apply rename 'app' to 'flask_app'
clear docstring's quotation
use functools.warps()
remove unnecessary echo
use dict.pop()
remove pass