add template css, js, fonts to app/assets
tweak application.html
generate welcome#index
User model

* Generate devise user model, add first_name, last_name, and phone columns
* Create _registration_form partial in devise/shared
sign_up_spec

* create user sign up feature spec
* user unit tests
* hide devise secret key
create _navbar, _side_content partials
Application layout

* create center_main_content, footer and side_content partials