Taser Execs Selling Heavily on the News  NEW YORK (Reuters) - Shares of Taser International Inc.  &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=TASR.O target=/stocks/quickinfo/fullquote"&gt;TASR.O&lt;/A&gt; have jumped 20 percent since early last week as the  stun gun maker issued a slew of announcements painting a  positive picture of its business prospects.