changed db_connect to include a db existence check; commented out a lot of stuff that's not ready yet.

	modified:   create.rb
	modified:   labstream-db.rb
	modified:   users.rb
	modified:   views/labstream.haml
first working version; user logins ok and functioning.

	modified:   ../README.md
	modified:   ../database design
	modified:   ../labstream-db.rb
	modified:   ../mainpage.rb
	new file:   css/initialize.css
	modified:   css/labstream.css
	modified:   ../users.rb
	new file:   ../views/boilerplate.haml
	new file:   ../views/initialize.haml
	modified:   ../views/labstream.haml
	modified:   ../views/login.haml