Implemeted course builder

Steps to create course:
 1) before creating course we need to create module
  steps to create module:
      i) make page/page/image/video/quize collection by adding collection to some node
      ii) if some Node has collection a "Make module" button will appear on Node_detail_page
     iii) click on "Make module" it will make a module with the name of that node 
     iv) browse Module by clicking on Module app
   Note: module is snap shot of Node's collection it preserver the version no of current Nodes
 2)for creating course click on course app and a button "create" on course page it will redirect to you on interface of course creator put name and description of course and add module by clicking Add module tab
 3) browse course by clicking on course app