Cyberonics Up, Andrew Down Before Bell  NEW YORK (Reuters) - Shares of Cyberonics Inc. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=CYBX.O target=/stocks/quickinfo/fullquote"&gt;CYBX.O&lt;/A&gt;  jumped 14 percent before the bell on Thursday after the medical  technology company said federal health regulators had given  conditional approval to a depression treatment.