project 4.7.x-2.0

The initial release of the 4.7.x-2.x series which implements the new release system.
Note: if you are currently running the 4.7.x-1.x series, you should not update to the 4.7.x-2.x series until i've had a chance to write up documenation on the conversion process. If you have releases currently on your system, you will almost certainly need to modify some of the code in the conversion script included in this release to properly convert the releases on your site.