Add RBTools ebuild
(Portage version: 2.1.11.60/hg/Linux x86_64, unsigned Manifest commit)
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
<maintainer>
<email>rich0@gentoo.org</email>
</maintainer>
</pkgmetadata>