converted newadmin to coincede with new page layout and structure
removed grunt.js cause it's fucking annoying
Changed newadmin to admin, admin to oldadmin
1. Preparing admin page to incorporate Users table. 2. Added ability to export data (although doens't seem to currently work)
1. commit before pulling David's home page
1. Resolve merge conflict in admin page, now admin = newadmin page
1. Added "POST /Registrations/dropAndGetEnrolledSections" to perform both drop and getEnrolledSections methods;
2. Added security checks for all section mutators in sections_controller;
3. Added "POST /Sections/getSectionsByInstructor"
4. Disable all validations for "day" column but calculate the day field in the BE on creating the section.
   Now to create a section, there is no need to input day field