FIX: in some case bundle exec fails from spawn

there is some bundler magic in here, prefer bin stubs anyway
cause they are a bit faster

lib/autospec/simple_runner.rb

@@ -7,15 +7,17 @@ module Autospec
     def run(specs)
       puts "Running Rspec: " << specs
       # kill previous rspec instance
-      abort
+      self.abort
       # we use our custom rspec formatter
       args = ["-r", "#{File.dirname(__FILE__)}/formatter.rb",
               "-f", "Autospec::Formatter", specs.split].flatten.join(" ")
       # launch rspec
-      @pid = Process.spawn({"RAILS_ENV" => "test"}, "bundle exec rspec #{args}")
+      Dir.chdir(Rails.root) do
+        @pid = Process.spawn({"RAILS_ENV" => "test"}, "bin/rspec #{args}")
         _, status = Process.wait2(@pid)
         status.exitstatus
       end
+    end
 
     def abort
       if @pid