added listing_all_links_spec
added adding_list_spec
updated adding_list_spec
tried using serach links
added user sign up
fixed not displaying welcome message(user to User)
played with css file
added sigh up button
added password confirmation
added handling user input errors features
added properties for email uniqueness
email uniqueness error
added Rakefile
added user signing in
added sign out functionality
refactored server.rb, and moved lib models in app/models/