Provide an implementation of the ThreadFactory interface

The Executor framework in Java 1.5 uses the ThreadFactory interface for creating new threads on demand. Currently there is no base implementation of this interface. So if an application needs to configure threads used by an ExecutorService, it has to create a custom implementation.

This is a proposal to add a default ThreadFactory implementation which allows an application to configure some options of the threads to be created. Especially the names of newly created threads and their daemon status can be configured. Maybe the configuration options can be extended, e.g. for specifying a priority or an uncaught exception handler.