Quit Installer Example

 <?xml version="1.0"?>
 <Package>
     <DisplayName>Quit an installer</DisplayName>
     <Description>Quits the installer in a nice way, if there is something missing</Description>
     <Version>1.0.1</Version>
     <ReleaseDate>2013-02-27</ReleaseDate>
     <Default>true</Default>
     <Script>installscript.js</Script>
 </Package>