Remove usage of spork in specs.

Index: ruby-buff-ruby-engine/spec/spec_helper.rb
===================================================================
--- ruby-buff-ruby-engine.orig/spec/spec_helper.rb
+++ ruby-buff-ruby-engine/spec/spec_helper.rb
@@ -14,7 +14,7 @@ def setup_rspec
   end
 end
 
-if Buff::RubyEngine.jruby?
+if true
   require 'buff/ruby_engine'
   setup_rspec
 else
