add username to people and make unique to account
delegate username to user
add username field to edit user settings
Add usernames to accounts #391
Add capybara for integration tests #407
add signup feature spec
add username to new account / signup form
Make accepting an invitation have the same layout / look as the new
signup #408

  - also added username field to form
remove pry debugger
Added show and update to Api::AccountsController
Check access for user when updating account
Fix up some failing tests
Merge branch 'pull/186'
Merge pull request #185 from pksunkara/399

Added show and update to Api::AccountsController
Merge pull request #184 from jess/username

add username, setup capybara, add some integration specs, redesign invitation signup page