tinymce refactoring for notes using JS. DMPRoadmap/roadmap#571 ...

tinymce refactoring for notes using JS. DMPRoadmap/roadmap#571

tinymce refactoring for answers using JS. TODO adding events. DMPRoadmap/roadmap#571

tinymce gem removed from any view. DMPRoadmap/roadmap#571

tinymce answer events for editor working. DMPRoadmap/roadmap#571

fixed typos in js.erb template. DMPRoadmap/roadmap#571

extend renamed to define since more appropiate. DMPRoadmap/roadmap#571

front-end dependencies handled through npm. DMPRoadmap/roadmap#551