Changed root to an actual homepage

root now goes to the Welome#index
Added a Sign-up link
Changed the root route.
Added in rspec files
Started a file for rspec tests of models.
Having issues with authenticate

Rails 3 does not have a find_by method and I'm looking for a
substitute.
Almost done with User modeling

still need to confirm authenticate works, then need to construct a
basic UI to try things out.