rockbuild testing

This is to set up a test client for the Rockbuild development.

1. Check out the Rockbox source into a new directory: svn co svn://svn.rockbox.org/rockbox/trunk rbtest
2. cd rbtest
3. Make sure you have the arm-elf-eabi-gcc compiler installed: arm-eabi-gcc444 --version
   (If you didn't, run tools/rockboxdev.sh and install it.)
4. Download runclient.sh: curl -O rockbuild.haxx.se/test/runclient.sh
5. Edit runclient.sh and change the username parameter.
6. Download rbclient.pl: curl -O rockbuild.haxx.se/test/rbclient.pl
7. sh runclient.sh