Update Embedly info URL in config

Signed-off-by: Andrew Phelps <andrew@phel.ps>
Check for OPENFUEGO_EMBEDLY_API_KEY before calling openfuego_get_metadata()

Signed-off-by: Andrew Phelps <andrew@phel.ps>
Updated to support new Embedly APIs, URLs

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