update therubyracer to fix https://github.com/cowboyd/therubyracer/issues/226
added pry to development group
added cms tags for menu
add identifier to menu, so it can be used in cms tags
Merge branch 'menus' of github.com:omegainteractive/rorpress into menus

* 'menus' of github.com:omegainteractive/rorpress:
  Added Gemfile.lock