Prefer ::gentoo over ::guru if eclass has the same name.

Also document dependency on ::guru.

README.adoc

@@ -4,9 +4,11 @@
 :uri-eselect-repository: https://wiki.gentoo.org/wiki/Eselect/Repository
 :uri-layman: https://wiki.gentoo.org/wiki/Layman
 :uri-pgp-key: https://tastytea.de/tastytea.asc
+:uri-guru: https://wiki.gentoo.org/wiki/Project:GURU
 
 This is an unofficial repository for link:{uri-portage}[Portage],
-link:{uri-gentoo}[Gentoo]'s package manager.
+link:{uri-gentoo}[Gentoo]'s package manager. It depends on the
+link:{uri-guru}[GURU] repository.
 
 All ebuilds are marked as testing. All live-ebuilds have no keywords. I will
 delete ebuilds I no longer use.

metadata/layout.conf

@@ -1,4 +1,4 @@
-masters = gentoo guru
+masters = guru gentoo
 repo-name = tastytea
 thin-manifests = true
 sign-commits = true