Birdhousebuilder.recipe.supervisor

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* updated buildout and doctests.
* enabled travis.
* replaced conda.makedirs by os.makedirs.
* using zc.recipe.deployment.
* using run-directory.

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* fixed use-monitor option.

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* cleaned up configuration files.
* added more supervisord options: host, port, username, password, use_monitor.

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* remove supervisor config files after uninstall.

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* added DAEMON_OPTS env variable to set additional parameters when starting supervisord.

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* added ``stopsignal`` option.
* fixed ``stopasgroup`` option.