Use the new beta build env on Travis

faster boot times, more ram, more cpu, better network
also removed an unneeded 'bundle install' bit that Travis does

.travis.yml

@@ -11,7 +11,7 @@ gemfile:
   - Gemfile_ar32
   - Gemfile_ar40threadsafe
 
-install: bundle install
+sudo: false
 
 before_script: echo $OLD_RAKE