Util: Print a stacktrace when aborting

Closes jquerygh-50

Author: jzaefferer

lib/util.js

@@ -30,8 +30,11 @@ Release.define({
 	},
 
 	abort: function( msg ) {
+		var error = new Error();
+		Error.captureStackTrace( error );
 		console.log( msg.red );
 		console.log( "Aborting.".red );
+		console.log( error.stack );
 		process.exit( 1 );
 	},