* Migrate flask_script to the Flask built-in click.
Flask 0.11 is the built-in integration of the click command line interface.
Flask-Migrate support for the new Flask CLI based on Click after Release 2.0.0.
* Resolved merge conflicts.
* Fixed issue introduced from bad merge.
* Fixed flake8 errors, added build to excluded flake8 stuff.
* * Moved the FlaskGroup declaration to the driver script.
* Moved shell context definition to cli.py
* Switched shell context definition to use decorator.
* Moved create_app definition to cli.py
* Fixed InvocationError with a wrapped function
* Added extra newlines between functions
* Removed flask-script dependency.
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