Custom setup.py commands use os.system

[dobey]

    def run(self):
        os.system('rm -rf build dist')

    def run(self):
        if not os.path.exists('build/docs'):
            os.makedirs('build/docs')
        os.system(
            'rst2html docs/introduction.txt build/docs/introduction.html')
        os.system(
            'rst2html docs/writingplugins.txt build/docs/writingplugins.html')

    def run(self):
        os.system('python setup.py sdist')
        os.system(
            'gpg --armor --sign --detach-sig `find dist -name "tarmac-*"`')