Add basic admin setup incl. login and views and templates

Changelog:
	config/ion_auth
		-switch to bcrypt

	controllers/admin
		-add logout() method

	controllers/auth
		-add login() method

	controllers/user
		-add index() method

	add BCrypt library

	views/templates
		-add admin_main template
		-add admin_auth template

	views
		-add login
		-add users/index

	views/widgets
		-add admin_header
		-add admin_footer