Manage.py entry point

[James Pic]

Currently, manage.py-tpl executes in an

if __name__ == '__main__':

block.

While this might work when declaring manage.py as script in setup.py, a popular convention is to use the entry_point feature of setup.py.

To add support for entry_point in manage.py-tpl we only need to move the code from the if block into a new function ie. main() and call in it in the if-block.

Then, manage.py-tlp will also work as entry_point with yourproject.manage:main and using manage.py as script will also still work.

This removes a manual effort every time a project is used by a follower of the entry_point convention, without causing any issue for regular users.