Added Constants file

Added a constants.js file, where all assumed (hardly changing) elements
are stored in the form of arrays.
Added global functions file

Added globalFunctions.js file to house all global client-side functions
used throughout the system
Created session file

Session.js created -  a way to store user information after login
Added login page and scripts
Request

renamed page 2 to request and started making fields
Login Button and Error Message on login page

Added login button
Error message added
Renamed request

renamed Request.html to request.html and edited hyperlink in index.html
Index.html header

changed page 2 to request
checkbox generation

attempt to get checkboxes generated
Working on request.html

Got checkboxes working
Rename Request.html to request.html
Merge branch 'FrontEnd' into SubMaster
Merge branch 'Controllers' of https://github.com/team-16/TimetablingSystem into Controllers