Don't use isolate when testing.

--- Rakefile.orig	Wed Jul  3 11:38:31 2013
+++ Rakefile	Wed Jul  3 11:38:49 2013
@@ -9,7 +9,6 @@ Hoe.add_include_dirs("lib",
                      "../../sexp_processor/dev/lib")
 
 Hoe.plugin :seattlerb
-Hoe.plugin :isolate
 
 Hoe.spec 'ruby2ruby' do
   developer 'Ryan Davis', 'ryand-ruby@zenspider.com'