Move dub.utils to dub.internal.utils and update copyright dates.

Remove installation.d from build-files.txt.

Fix build script for missing registry.d file. Fixes #95.

Preparing for the new std.process in Phobos.

Changed the windows build script to directly call the compiler instead of rdmd. ...

The compiler used can be customized by setting the DC environment variable ("dmd" is the default and "gdmd" or "ldmd" are the most likely alternatives).