Allow specifying webdefault.xml for jetty. Useful on windows for fixing file locking issue.

sbt_pending/src/main/scala/sbt/DefaultProject.scala

@@ -387,6 +387,7 @@ abstract class BasicWebScalaProject extends BasicScalaProject with WebScalaProje
 			def port = jettyPort
 			def log = p.log
 			def jettyEnv = jettyEnvXml
+			def webDefaultXml = jettyWebDefaultXml
 		}
 	/** This is the classpath used to determine what classes, resources, and jars to put in the war file.*/
 	def webappClasspath = publicClasspath
@@ -420,6 +421,7 @@ abstract class BasicWebScalaProject extends BasicScalaProject with WebScalaProje
 	def jettyPort: Int = JettyRunner.DefaultPort
 
 	def jettyEnvXml : Option[File] = None
+	def jettyWebDefaultXml : Option[File] = None
 
 	lazy val jettyReload = task { jettyInstance.reload(); None } describedAs(JettyReloadDescription)
 	lazy val jettyRestart = jettyStop && jettyRun

web/LazyJettyRun.scala.templ

@@ -58,6 +58,7 @@ private object LazyJettyRun${jetty.version} extends JettyRun
 					import c._
 					configureDefaultConnector(server, port)
 					val webapp = new WebAppContext(war.absolutePath, contextPath)
+					webDefaultXml.foreach{webDefaultXml:File => webapp.setDefaultsDescriptor(webDefaultXml.toString)}
 					
 					def createLoader =
 					{

web/WebApp.scala

@@ -103,6 +103,7 @@ trait DefaultJettyConfiguration extends JettyConfiguration
 	def classpath: PathFinder
 	def parentLoader: ClassLoader
 	def jettyEnv: Option[File]
+	def webDefaultXml: Option[File]
 }
 abstract class CustomJettyConfiguration extends JettyConfiguration
 {