title: setting negative literals in NVelocity
body: <p>I'm trying to set a negative literal in my NVelocity template and it doesn't parse. Is there a trick to making this work?</p>
  
  <p><b>Positive</b> numbers work:<br/>
      #set($age = 27)<br/></p>
  
  <p><b>Negative</b> numbers do not work:<br/>
      #set($age = -27)<br/>
      #set($age = 27*-1)</p>
  
  <p>Lexical error: NVelocity.Runtime.Parser.TokenMgrError: Lexical error at line 62, column 15. Encountered: "-" </p>
  
  <p>I'm using Castle.NVelocity (dll-AssemblyVersion 1.1.1.0, FileVersion=1.1.1.60), not the older Apache release</p>