Login and sign up pages.
Merge branch 'master' into users

Conflicts:
	app/controllers/sessions_controller.rb
	app/controllers/users_controller.rb
	app/views/layouts/application.html.erb
	app/views/sessions/new.html.erb
	app/views/users/new.html.erb
	config/routes.rb
	test/controllers/sessions_controller_test.rb
	test/controllers/users_controller_test.rb
Handle submit buttons
Add registration errors

This needs to be styled.
Relate palettes to users
Updated navigation for users.
Hiding Editor option unless it’s used.
Added icons to new menu.
Improve error display

Still needs more styling.
Better looking form errors.
Merged with upstream.
Explanatory text for creating a user.
Add guachiman for authorization
Add kaminari
Add parent-child palette relationships
Fix
Fix authorization
Remove bad methods
Add uniqueness validator for users.
Add Palette.leafs