Don't set group tags

They are unused in Fedora.

rest.spec

@@ -3,7 +3,6 @@ Version:       0.8.0
 Release:       1%{?dist}
 Summary:       A library for access to RESTful web services
 
-Group:         System Environment/Libraries
 License:       LGPLv2
 URL:           http://www.gnome.org
 Source0:       http://download.gnome.org/sources/%{name}/0.8/%{name}-%{version}.tar.xz
@@ -25,7 +24,6 @@ this library is attempting to support.
 
 %package devel
 Summary: Development package for %{name}
-Group: Development/Libraries
 Requires: %{name}%{?_isa} = %{version}-%{release}
 
 %description devel