Util: Allow an error to be passed to Release.abort()

When generating a new stack trace, don't include Release.abort().

Ref gh-53

Author: scottgonzalez

README.md

@@ -141,9 +141,10 @@ need to install dependencies which are only necessary for the release.
 
 Defines new properties and methods to add to the `Release` object.
 
-#### abort( msg )
+#### abort( msg [, error ] )
 
-Aborts the release and prints the message.
+Aborts the release and prints the message. If an error object is provided, it is
+used for the stack trace, otherwise the current call stack is used.
 
 #### exec( command, options )
 

lib/util.js

@@ -29,12 +29,17 @@ Release.define({
 		process.chdir( directory );
 	},
 
-	abort: function( msg ) {
-		var error = new Error();
-		Error.captureStackTrace( error );
+	abort: function( msg, error ) {
+		if ( !error ) {
+			error = new Error( msg );
+			Error.captureStackTrace( error, Release.abort );
+		}
+
 		console.log( msg.red );
 		console.log( "Aborting.".red );
+		console.log();
 		console.log( error.stack );
+
 		process.exit( 1 );
 	},