Does not use Python interpreter specified in a Sublime project file.

[tedmiston]

This is important, because third party packages installed in the virtual environment (not system globally) will not be found.

e.g., Foo.sublime-project:

{
    "folders":
    [
        ...
    ],
    "settings":
    {
        "python_interpreter": "/Users/taylor/.virtualenvs/my-project/bin/python"
    }
}

It should use settings['python_interpreter'] when it's specified.