Add website url to user

CHANGELOG

app/models/user.rb

app/views/admin/users/_form.html.haml

app/views/profiles/show.html.haml

app/views/users/_profile.html.haml

db/migrate/20140116231608_add_website_url_to_users.rb

db/schema.rb

doc/api/session.md

doc/api/users.md

features/profile/profile.feature

features/steps/profile/profile.rb

lib/api/entities.rb

lib/api/users.rb

spec/models/user_spec.rb