Added examples for use with openfuego_get_items()

Signed-off-by: Andrew Phelps <andrew@phel.ps>
Fix some logic with openfuego_get_metadata()'s handling of single URLs

Signed-off-by: Andrew Phelps <andrew@phel.ps>
(Temporarily?) remove defunct functions; return false if tweet status ID is 404

Signed-off-by: Andrew Phelps <andrew@phel.ps>