EM-REACT

!Known issues:

• we cannot update to react ^15.5.0 because of the new additions:
  • Added a deprecation warning for React.createClass. Points users to create-react-class instead. (@acdlite in d9a4fa4);
  • Added a deprecation warning for React.PropTypes. Points users to prop-types instead. (@acdlite in 043845c);
• we cannot remove react-addons-css-transition-group dependecy and add css-transition-group dependency because of time consuming refactoring;