Changes user model, itegrates Devise and Pundit
fixes db migration that renames qrcode to qr_code not null
adds dummy signout to landing page navbar
not null bulshit fixes
basic qr_code (uuid) generation
FUCK YES LOGIN WORKS
Fixes conflicts
Merge remote-tracking branch 'origin/scanner_layout' into scanner_layout

Conflicts:
	app/controllers/users/registrations_controller.rb
created /users view
Changes login, registration urls, defines /users layout
Changed User profile redirect
Changed edit profile layout
Alert pops up upon submitting email in landing page
Added alert to scanning QRcode
Added require 'devise'
Fix herokuapp push ver1
Moved gems devise and poltergeist from dev,test to top of gemfile
Changed colours in several htmls for users
Changed colorscheme for /user htmls
Changed /user scheme, fixed color collisions